# SI Dimensions of Physical Quantities: Alphabetic List for IAS

Click here to read Current Affairs & GS.

## SI Dimensions of Physical Quantities: ‘A’ Alphabetic List

 A: Quantity Dimension Alternatives Definition/Notes Abbé number | Constringence | V-number 1 Dimensionless VD = (nD-1) / (nF-nC) Absorbed radiation dose m2. s-2 J. kg-1, Gy (gray) [Energy] / [Mass] Absorbed dose rate m2. s-3 Gy. s-1 [Absorbed dose] / [Time] Acceleration, angular s-2 rad. s-2 [ΔAngular velocity] / [ΔTime] Acceleration|Deceleration m. s-2 [ΔVelocity] / [ΔTime] Acoustic impedance/resistance/reactance kg. m-4. s-1 Pa. s/m3, reyl/m2 [Pressure] / [Volume flow rate] Acoustic impedance, specific kg. m-2. s-1 Pa. s/m , reyl [ΔPressure] ⚹ [Velocity] . Also s. acu. resistance/reactance Acoustic conductance, specific kg-1. m2. s reyl-1 Inverse of s. acu. impedance. Also s. acu. susceptance Action kg. m2. s-1 J. s [Energy] ⚹ [Time] , [Moment of motion] ⚹ [Distance] Activity of a radioactive source s-1 Bq (becquerel) [Counts] / [Time] Activity, katalytic mol. s-1 katal [ΔQuantity] / [Time] . Same as molar production rate Activity, transactions rate s-1 1/year [Transactions] / [Time period] . Economy and finance Admittance, inductive kg-1. m-2. s3. A2 S (siemens) 1/ [Inductive impedance] Admittance, of a circuit kg-1. m-2. s3. A2 S (siemens) 1/ [Circuit impedance] Advection velocity m. s-1 m/s In porous media; actual progress along pressure gradient Albedo, of a surface 1 Dimensionless [Reflected elmag power] / [Incident elmag power] Amplification|Attenuation (generic) 1 usually in dB [Quantity (p) ] / [Quantity (p ′ ) ] , with p being some parameter Angular acceleration s-2 rad. s-2 [ΔAngular velocity] / [ΔTime] Angular moment of inertia kg. m2 [Mass] ⚹ [Distance2] Angular moment of motion kg. m2. s-1 J. s [Moment of motion] ⚹ [Distance] . Like [action] Angular velocity s-1 rad. s-1 [ΔPlane angle] / [ΔTime] Annealing point K Temperature at which viscosity drops below 1012 Pa. s Area m2 [Distance] ⚹ [Distance] Area growth rate m2. s-1 [ΔArea] / [Time] Asset|Wealth cur currency Economy and finance Atomic number 1 Dimensionless Number of protons in an atomic nucleus Atomic weight | Relative atomic mass au atomic units Average over a typical isotopic composition Attenuation|Amplification (generic) 1 usually in dB [Quantity (p) ] / [Quantity (p ′ ) ] , with p being some parameter Attenuation/amplification over a distance m-1 dB/m [Attenuation] / [Distance] . Mostly in acoustic and electronics Attenuation/amplification over a period s-1 dB/s [Attenuation] / [Time] . Mostly in acoustic and electronics

## SI Dimensions of Physical Quantities: ‘B’ Alphabetic List

 B: Quantity Dimension Alternatives Definition/Notes Bandwidth s-1 Hz [ΔFrequency] Baud rate | Information flux bit. s-1 baud [Information] / [Time] Bond duration s year Economy and finance Bulk modulus kg. m-1. s-2 N. m-2, Pa ( [ΔVolume] / [Volume] ) / [Pressure] . Inverse of compressibility

## SI Dimensions of Physical Quantities: ‘C’ Alphabetic List

 C: Quantity Dimension Alternatives Definition/Notes Capacitance, electric kg-1. m-2. s4. A2 C. V-1, F (farad) [Charge] / [ΔPotential] Capacitive reactance kg. m2. s-3. A-2 Ω (ohm) 1/ (i [Angular frequency] . [Capacitance] ) Capacitive susceptance kg-1. m-2. s3. A2 S (siemens) 1/ [Capacitive reactance] Cash flow cur. s-1 currency/year [Value] / [ΔTime] . Economy and finance Circulation m2. s-1 J. s. kg-1 [Angular moment] / [Mass] , [Velocity] ⚹ [Loop length] Characteristic impedance kg. m2. s-3. A-2 V. A-1, Ω, ohm √ ( [Mag. Permeability] / [El. Permittivity] ) Charge, electric s . A C (coulomb) [Current] ⚹ [Time] Charge, magnetic (bound) m-2. A - ∇ . [Magnetization] , -Divergence of magnetization Charge, quantum 1 Dimensionless [Charge] / [Elementary charge quantum] Charge, molecular/ionic, quantum 1 Dimensionless [Charge of a molecule or ion] / [Elementary charge quantum] Charge density m-3. s. A C. m-3 [Charge] / [Volume] Charge/mass ratio | Specific charge kg-1. s. A C. kg-1 [Charge] / [Mass] Charge, molar s. A. mol-1 C. mol-1 [Charge] / [Quantity] Chemical potential, molar kg. m2. s-2. mol-1 J. mol-1 [ΔInternalEnergy] / [ΔQuantity] Circuit admittance kg-1. m-2. s3. A2 S (siemens) 1/ [Circuit impedance] Circuit impedance kg. m2. s-3. A-2 Ω (ohm) Circulation/velocity of money s-1 1/year [Transactions] / [Time period] . Economy and finance Circumference|Perimeter m Collision cross section | Cross section m2 [Distance] ⚹ [Distance] Compressibility kg-1. m. s2 Pa-1 [Pressure] / ( [ΔVolume] / [Volume] ) . Inverse of bulk modulus Compression kg. m-1. s-2 N. m-2, Pa (pascal) [Force] / [Area] . Same as pressure Compression factor of a real gas 1 Dimensionless pV/ (nRT) . For ideal gas equals 1; temperature dependent Compressive strength kg. m-1. s-2 N. m-2, Pa [Force] / [Area] . Like pressure Concentration, molar m-3. mol [Quantity] / [Volume] . Same as molar density Concentration gradient, molar m-4. mol [Molarity] / [Distance] . Same as molarity gradient Concentration ratio, molar 1 Dimensionless [Partial quantity] / [Total quantity] Concentration ratio, by mass 1 Dimensionless [Partial mass] / [Total mass] Concentration ratio, by volume 1 Dimensionless [Partial volume] / [Total volume] . . Concentration, by weight (obsolete) 1 Dimensionless [Partial mass] / [Total mass] . Obsolete: use by mass Conductance, electric kg-1. m-2. s3. A2 A. V-1, S (siemens) 1/ [Resistance] Conductivity, electric kg-1. m-3. s3. A2 S. m-1 1/ [Resistivity] Conductivity, hydraulic m. s-1 m/s Used for porous media Conductivity, molar kg-1. s3. A2. mol-1 S. m2. mol-1 [El. conductivity] / [Concentration] Conductivity, thermal kg. m. s-3. K-1 W. m-1. K-1 [Heat flux] / ( [Distance] ⚹ [ΔTemperature] ) Constringence | Abbé number | V-number 1 Dimensionless VD = (nD-1) / (nF-nC) Convergence m-1 dioptry in optics, but not only Cosmological constant Λ m-2 Present in Einstein՚s equation Cosmological expansion rate s-1 km/s/Mpc [Velocity] / [Distance] . Mpc stands for Megaparsec Count of events/instances 1 This covers all kinds of enumerations Count rate s-1 [Counts] / [Time] Couple kg. m2. s-2 N. m 2 ⚹ [Force] ⚹ [Distance] for two non-aligned opposing forces Critical angle of repose rad or degree Steepest angle of a slope before a slide Cross section m2 [Distance] ⚹ [Distance] Cryoscopic constant kg. mol-1. K K/ (mol/kg) [ΔTemperature] / [Molality] Current, electric A A (ampere) Current density, electric m-2. A [Current] / [Area] . Same as current intensity Current intensity, electric m-2. A [Current] / [Area] . Same as current density Current noise, variance nJ2 s. A2 A2/Hz [Current] 2/ [Bandwidth] Curvature m-1 1/ [Curvature radius] Curvature radius m of a line in plane/space or surface in space

## SI Dimensions of Physical Quantities: ‘D’ Alphabetic List

 D: Quantity Dimension Alternatives Definition/Notes D ‘Alembert operator | D’ Alembertian m-2 (1/c2) ∂ 2/ ∂ t2 - ∂ 2/ ∂ x2 - ∂ 2/ ∂ y2 - ∂ 2/ ∂ z2 Debt|Liability cur currency Economy and finance Debt/GDP ratio s year [Debt] / [Earnings] . Economy and finance Deceleration|Acceleration m. s-2 [ΔVelocity] / [ΔTime] Deceleration, angular s-2 rad. s-2 [ΔAngular velocity] / [ΔTime] Density of electric charge m-3. s. A C. m-3 [Charge] / [Volume] Density of electric current m-2. A [Current] / [Area] . Same as current intensity Density of energy kg. m-1. s-2 J. m-3 [Energy] / [Volume] Density of mass kg. m-3 [Mass] / [Volume] . Same as specific density Density of mass, gradient of kg. m-4 [Mass density] / [Distance] . Same as specific density gradient Density of particles m-3 [Count] / [Volume] . Obsolete: number density Density of substance m-3. mol [Quantity] / [Volume] . Same as molar concentration Derivative with respect to time s-1 d/dt, ∂ / ∂ t Derivative with respect to a length m-1 d/dr, ∂ / ∂ r, r = x|y | z Dielectric constant | Relative permittivity 1 Dimensionless [Permittivity] / [Permittivity of vacuum] Dielectric strength/rigidity | Electric strength kg. m. s-3. A-1 V. m-1 [ΔPotential] / [Distance] Diffusion coefficient m2. s-1 [Distance] 2/ [Time] Diffusivity, thermal m2. s-1 ( [∂ Temperatute] / [∂ Time] ) / [∇ 2Temperature] . Dipole moment, electric m. s. A C. m [Charge] ⚹ [Distance] Dipole moment, magnetic m2. A J. T-1 [Current] ⚹ [Area] Dispersive power 1 Dimensionless Ratio of differences of refractive indices Dispersivity quotient m-1 [ΔRefractive index] / [ΔWavelength] Displacement, electric m-2. s. A C. m-2 [Charge] / [Area] . Same as electric flux density Displacement four-tensor (relativistic Dμν) m-1. A Like magnetic intensity Distance m in all Euclidean n-dimensional spaces Dose of absorbed radiation m2. s-2 J. kg-1, Gy (gray) [Energy] / [Mass] Dose rate m2. s-3 Gy. s-1 [Absorbed dose] / [Time] Drift speed m. s-1 Steady-state speed of an object. . Duration s s (second) Dynamic viscosity kg. m-1. s-1 Pa. s ( [Force] / [Area] ) / [ΔVelocity]

## SI Dimensions of Physical Quantities: ‘E’ Alphabetic List

 E: Quantity Dimension Alternatives Definition/Notes Earnings|Income rate cur. s-1 currency/year [Value] / [Time period] . Economy and finance Ebullioscopic constant kg. mol-1. K K/ (mol/kg) [ΔTemperature] / [Molality] Electric capacitance kg-1. m-2. s4. A2 C. V-1, F (farad) [Charge] / [ΔPotential] Electric charge s . A C (coulomb) [Current] ⚹ [Time] Electric conductance kg-1. m-2. s3. A2 A. V-1, S (siemens) [Current] / [ΔPotential] . Inverse of resistance Electric conductivity kg-1. m-3. s3. A2 S. m-1 1/ [Resistivity] Electric conductivity, molar kg-1. s3. A2. mol-1 S. m2. mol-1 [El. conductivity] / [Concentration] Electric current A A (ampere) Electric dipole moment m. s. A C. m [Charge] ⚹ [Distance] Electric displacement m-2. s. A C. m-2 [Charge] / [Area] . Same as electric flux density Electric field strength | Electric intensity kg. m. s-3. A-1 V. m-1 [ΔPotential] / [Distance] Electric field gradient kg. s-3. A-1 V. m-2 [ΔEl. field strength] / [Distance] Electric flux density | Electric induction m-2. s. A C. m-2 [Charge] / [Area] Electric inductance kg. m2. s-2. A-2 V. s. A-1, H (henry) [ΔPotential] / [dCurrent/dt] Electric induction m-2. s. A C. m-2 [Charge] / [Area] . More properly electric flux density Electric intensity kg. m. s-3. A-1 V. m-1 [ΔPotential] / [Distance] . More properly electric field strength Electric permittivity kg-1. m-3. s4. A2 F. m-1 [El. flux density] / [El. field strength] Electric permittivity, relative 1 Dimensionless [Permittivity] / [Permittivity of vacuum] . Same as dielectric constant Electric polarization m-2. s. A C. m-2 [Charge] / [Area] . Like electric flux density Electric potential kg. m2. s-3. A-1 W. A-1, J. C-1, V (volt) [Power] / [Current] , [Energy] / [Charge] Electric quadrupole moment m2. s. A C. m2 [Electric dipole] ⚹ [Distance] , [Electric charge] ⚹ [Distance2] Electric resistance kg. m2. s-3. A-2 V. A-1, Ω (ohm) [ΔPotential] / [Current] Electric resistivity kg. m3. s-3. A-2 Ω. m ( [Resistance] ⚹ [Length] ) / [Area] Electric strength | Dielectric strength kg. m. s-3. A-1 V. m-1 [ΔPotential] / [Distance] . . Electromagnetic field tensor (relativistic Fμν) kg. s-2. A-1 T Like magnetic flux density Electromagnetic displacement (relat. Dμν) m-1. A Like magnetic intensity Electromagnetic four-current (relativistic Jα) m-2. A Like current density and [Charge] ⚹ [c] Electromagnetic four-potential (relativistic Aα) kg. m. s-2. A-1 m-1. s. V, m. T Like magnetic vector potential and [El. potential] / [c] Electromotive force (emf) kg. m2. s-3. A-1 V [ΔPotential] Electron affinity (always molar) kg. m2. s-2. mol-1 J. mol-1 Energy released binding an electron Electronegativity, Pauling χ 1 Dimensionless Relative tendency of an atom to attract electrons; χ (H) = 2.20. Electrostriction coefficient kg-2. m-2. s6. A2 m2. V-2 ( [ΔVolume] / [Volume] ) / [Electric field strength] 2 Emittance, luminous cd. sr. m-2 lm. m-2, lx (lux) [Luminous flux] / [Area] . Same as luminous exitance Energy kg. m2. s-2 N. m, J (joule) [Force] ⚹ [Distance] , [Power] ⚹ [Time] Energy, molar kg. m2. s-2. mol-1 J. mol-1 [Energy] / [Quantity] Energy, specific m2. s-2 J. kg-1 [Energy] / [Mass] Energy density kg. m-1. s-2 J. m-3 [Energy] / [Volume] Energy flux | Power kg. m2. s-3 J. s-1, W (watt) [ΔEnergy] / [ΔTime] Enthalpy kg. m2. s-2 J Like energy and heat Enthalpy, molar kg. m2. s-2. mol-1 J. mol-1 [Enthalpy] / [Quantity] . Like molar heat Enthalpy, specific m2. s-2 J. kg-1 [Enthalpy] / [Mass] . Like specific heat Entropy kg. m2. s-2. K-1 J. K-1 [ΔHeat] / [Temperature] Entropy, molar kg. m2. s-2. K-1. mol-1 J. K-1. mol-1 [Entropy] / [Quantity] Entropy, specific m2. s-2. K-1 J. K-1. kg-1 [Entropy] / [Mass] Evolution rate, log-scale s-1 d {ln (Q) } /dt = (dQ/dt) /Q. Same as relative evolution rate Expansion coefficient, thermal K-1 ( [ΔLength] / [Length] ) / [Temperature] Expansion rate, cosmological s-1 km/s/Mpc [Velocity] / [Distance] . Mpc stands for Megaparsec Expectation frequency s-1 [Counts] / [Time] . Like count rate Exposure kg-1. s. A C. kg-1 [Charge] / [Mass] . Used for ionising radiations Extinction coefficient m-1 dB/m [Ratio] /m. Used mostly for radiation

## SI Dimensions of Physical Quantities: ‘F’ Alphabetic List

 F: Quantity Dimension Alternatives Definition/Notes Field tensor, electromagnetic (relativistic Fμν) kg. s-2. A-1 T Like magnetic flux density Fire point K Temperature at which ignited vapour keeps burning Flash point K Temperature at which vapour can be kept burning Flow cur. s-1 currency/year [ΔValue] / [ΔTime] . Economy and finance: time derivative Flow rate, of mass | Mass production rate kg. s-1 [ΔMass] / [Time] . For example, through a pipe Flow rate, of volume m3. s-1 [ΔVolume] / [Time] . For example, through a pipe Force kg. m. s-2 N (newton) [Mass] ⚹ [Acceleration] Force, thermodynamic kg. m. s-2. mol-1 N/mol [ΔChemical potential] / [Distance] Four-current (relativistic Jα) m-2. A Like current density and [Charge] ⚹ [c] Four-potential (relativistic Aα) kg. m. s-2. A-1 m-1. s. V, m. T Like magnetic vector potential and [El. potential] / [c] Four-tensor elmag displacement (relat. Dμν) m-1. A Like magnetic intensity Four-tensor elmag field (relativistic Fμν) kg. s-2. A-1 T Like magnetic flux density Free energy kg. m2. s-2 J Also Helmholtz function. Like energy Free energy, molar kg. m2. s-2. mol-1 J. mol-1 [Free energy] / [Quantity] . Like Helmholtz function Free energy, specific m2. s-2 J. kg-1 [Free energy] / [Mass] . Like specific Helmholtz function Free enthalpy kg. m2. s-2 J Also Gibbs function. Like energy Free enthalpy, molar kg. m2. s-2. mol-1 J. mol-1 [Free enthalpy] / [Quantity] . Like molar Gibbs function Free enthalpy, specific m2. s-2 J. kg-1 [Free enthalpy] / [Mass] . Like specific Gibbs function Frequency of events s-1 [Counts] / [Time] Frequency of waves s-1 Hz hertz Frequency drift rate s-2 Hz. s-1 [ΔFrequency] / [Time] Friction kg. m. s-2 N Tangential force between two moving surfaces Friction coefficient 1 Dimensionless [Tangential force] / [Normal force] Fugacity kg. m-1. s-2 Pa Effective pressure in real gases

## SI Dimensions of Physical Quantities: ‘G’ Alphabetic List

 G: Quantity Dimension Alternatives Definition/Notes Gain of a device 1 Dimensionless [Output] / [Input] , like-quantities ratio. Often in dB GDP Gross domestic product cur. s-1 currency/year [Earnings] . Economy and financee: of an administrative region g-factor of a particle 1 Dimensionless [Magnetic moment] / ( [Spin] . [Bohr magneton] ) Gradient, of electric field kg. s-3. A-1 V. m-2 [ΔEl. field strength] / [Distance] Gradient, of magnetic field kg. m-1. s-2. A-1 T. m-1 [ΔMag. flux density] / [Distance] Gradient, of mass density kg. m-4 [Mass density] / [Distance] . Same as specific density gradient Gradient, of pressure kg. m-2. s-2 N. m-3, Pa/m [Pressure] / [Distance] Gradient, thermal K. m-1 [ΔTemperature] / [Distance] . Same as temperature gradient Gravitational constant G kg-1. m3. s-2 [Force] ⚹ [Distance] 2/ [Mass] 2. Appears in Newton՚s equation Gravitational field intensity | Gravity m. s-2 [Force] / [Mass] , [Acceleration] Gravitational field potential m2. s-2 [Energy] / [Mass] . Gravity | Gravitational field intensity m. s-2 [Force] / [Mass] , [Acceleration] Growth rate, relative s-1 [Relative variation] / [Time] Growth rate, linear m. s-1 [ΔLength] / [Time] Growth rate, of area/surface m2. s-1 [ΔArea] / [Time] Growth rate, of volume m3. s-1 [ΔVolume] / [Time] Gyromagnetic ratio kg-1. s. A Hz. T-1 [Mag. moment] / [Angular moment of motion]

## SI Dimensions of Physical Quantities: ‘H’ Alphabetic List

 H: Quantity Dimension Alternatives Definition/Notes Half life s of a non-conservative/decaying quantity Hamiltonian kg. m2. s-2 J [Force] ⚹ [Distance] , [Power] ⚹ [Time] . Like energy Hardness kg. m-1. s-2 N. m-2 [Force] / [Area] . Same as pressure Heat kg. m2. s-2 J Like energy Heat, molar kg. m2. s-2. mol-1 J. mol-1 [Heat] / [Quantity] Heat, specific m2. s-2 J. kg-1 [Heat] / [Mass] Heat capacity kg. m2. s-2. K-1 J. K-1 [ΔHeat] / [ΔTemperature] Heat capacity, molar kg. m2. s-2. K-1. mol-1 J. K-1. mol-1 [Heat capacity] / [Quantity] Heat capacity, specific m2. s-2. K-1 J. K-1. kg-1 [Heat capacity] / [Mass] Heat conductivity | Thermal conductivity kg. m. s-3. K-1 W. m-1. K-1 [Heat flux] / ( [Distance] ⚹ [ΔTemperature] ) Heat flux kg. m2. s-3 J. s, W [ΔHeat] / [ΔTime] . Like power Heat flux density kg. s-3 W. m-2 [Heat flux] / [Area] . Same as irradiance Heat of fusion/evaporation, specific m2. s-2 J. kg-1 [Energy] / [Mass] Heat of fusion|evaporation, molar kg. m2. s-2. mol-1 J. mol-1 [Energy] / [Quantity] Hydraulic conductivity m. s-1 m/s Used for porous media Hydraulic permeability m2 1 darcy = 10-12 m2 [Velocity] ⚹ [Viscosity] / [Pressure gradient] , in porous media

## SI Dimensions of Physical Quantities: ‘I’ Alphabetic List

 I: Quantity Dimension Alternatives Definition/Notes Illuminance cd. sr. m-2 lm. m-2, lx (lux) [Luminous flux] / [Area] Impact resistance kg. s-2 J. m-2 [Energy] / [Area] Impedance, acoustic kg. m-4. s-1 Pa. s/m3, reyl/m2 [ΔPressure] / [Volume flow rate] . Also acu. resistance/reactance Impedance, acoustic, specific kg. m-2. s-1 Pa. s/m , reyl [ΔPressure] ⚹ [Velocity] . Also s. acu. resistance/reactance Impedance, characteristic, electric kg. m2. s-3. A-2 V. A-1, Ω, ohm √ ( [Mag. Permeability] / [El. Permittivity] ) Impedance, inductive kg. m2. s-3. A-2 Ω (ohm) i [Angular frequency] . [Inductance] Impedance, of a circuit kg. m2. s-3. A-2 Ω (ohm) Impulse kg. m. s-1 [ΔMoment of motion] , [Force] ⚹ [ΔTime] , [Mass] ⚹ [ΔVelocity] Income rate|Earnings cur. s-1 currency/year [Value] / [Time period] . Economy and finance Inductance kg. m2. s-2. A-2 V. s. A-1, Wb. A-1, H (henry) [ΔPotential] / [dCurrent/dt] , [Mag. flux] / [Current] Induction, electric m-2. s. A C. m-2 [Charge] / [Area] . Same as electric flux density Inductive admittance kg-1. m-2. s3. A2 S (siemens) 1/ [Inductive impedance] Inductive impedance kg. m2. s-3. A-2 Ω (ohm) i [Angular frequency] . [Inductance] Information bit-1 bit One bit is the elementary information quantum Information flux | Baud rate bit. s-1 baud [Information] / [Time] Intensity of electric current m-2. A [Current] / [Area] . Same as current density Interest 1 % [ΔWealth] / [Wealth] . Economy and finance Interest rate s-1 % /year [Interest] / [Time period] . Economy and finance Internal energy kg. m2. s-2 J Like energy and heat Internal energy, molar kg. m2. s-2. mol-1 J. mol-1 [Internal energy] / [Quantity] . Like molar heat Internal energy, specific m2. s-2 J. kg-1 [Internal energy] / [Mass] . Like specific heat Ion mobility kg-1. m-1. s2. A m2. s-1. V-1 [Velocity] / [Electric field strength] . Ionic force (strength) m-3. mol Sum ( [Concentration] ⚹ [Ionic quantum charge] 2) . Ionic quantum charge 1 Dimensionless [Ion charge] / [Elementary charge quantum] Ionic strength (force) m-3. mol Sum ( [Concentration] ⚹ [Ionic quantum charge] 2) . Ionization energy, molar kg. m2. s-2. mol-1 J. mol-1 Energy to ionize a molecule/atom Irradiance kg. s-3 W. m-2 [Heat flux] / [Area] . Same as heat flux density

## SI Dimensions of Physical Quantities: ‘J’ Alphabetic List

 J: Quantity Dimension Alternatives Definition/Notes Joule-Thomson coefficient kg-1. m. s2. K K. Pa-1 [ΔTemperature] / [ΔPressure]

## SI Dimensions of Physical Quantities: ‘K’ Alphabetic List

 K: Quantity Dimension Alternatives Definition/Notes Katalytic activity mol. s-1 katal [ΔQuantity] / [Time] . Same as molar production rate Kinematic viscosity m2. s-1 [Dynamic viscosity] / [Density] K-space vector|Reciprocal space position m-1

## SI Dimensions of Physical Quantities: ‘L’ Alphabetic List

 L: Quantity Dimension Alternatives Definition/Notes Lagrangian kg. m2. s-2 J [Force] ⚹ [Distance] , [Power] ⚹ [Time] . Like energy Laplace operator | Laplacian m-2 ∇ 2 = ∂ 2/ ∂ x2 + ∂ 2/ ∂ y2 + ∂ 2/ ∂ z2 Length m m (meter) Liability|Debt cur currency Economy and finance Linear stiffness kg. s-2 N. m-1 [Force] / [Displacement] … of a structure Logarithmic ratio logb (A/A ′ ) in any base b 1 Applicable to any ratio of commensurable quantities Logarithmic ratio ln (A/A ′ ) 1 Np Neper. Uses natural logarithm Logarithmic ratio Log (P/P ′ ) /10 1 dB (decibel) Uses base-10 logarithm. Aplies only to power P Logarithmic ratio Log (X/X ′ ) /20 1 dB (decibel) Aplies to voltages (X = V) and currents (X = I) Logarithmic scale differential 1 Dimensionless dQ/Q, d {ln (Q) } , for any quantity Q. Also relative differential Logarithmic scale probability density 1 1/Np [Probability] / [Natural-logarithmic ratio] Loss of a device 1 Dimensionless [Output] / [Input] , like-quantities ratio. Often in dB Luminance cd. m-2 [Luminosity] / [Area] Luminosity cd cd (candle) Same as luminous intensity Luminous coefficient 1 Dimensionless [Luminous efficacy] / [683 lm/W] . Same as luminous efficiency Luminous efficacy cd. sr. kg-1. m-1. s3 lm/W [Luminous flux] / [Power] Luminous efficiency 1 Dimensionless [Luminous efficacy] / [683 lm/W] . Same as luminous coefficient Luminous emittance cd. sr. m-2 lm. m-2, lx (lux) [Luminous flux] / [Area] . Same as luminous exitance Luminous energy cd. sr. s lm. s [Luminous flux] ⚹ [Time] . Known as talbot Luminous flux cd. sr lm (lumen) [Luminosity] ⚹ [Solid angle] . Same as luminous power Luminous intensity cd cd (candle) Same as luminosity Luminous power cd. sr lm (lumen) [Luminosity] ⚹ [Solid angle] . Same as luminous flux

## SI Dimensions of Physical Quantities: ‘M’ Alphabetic List

 M: Quantity Dimension Alternatives Definition/Notes Magnetic charge (bound) m-2. A - ∇ . [Magnetization] , -Divergence of magnetization Magnetic dipole moment m2. A J. T-1 [Current] ⚹ [Area] . Same as magnetic moment Magnetic field gradient kg. m-1. s-2. A-1 T. m-1 [ΔMag. flux density] / [Distance] Magnetic field strength | Magnetic intensity m-1. A [Current] / [Distance] Magnetic flux kg. m2. s-2. A-1 V. s, W. s. A-1, Wb (weber) [ΔPotential] ⚹ [Time] , [Power] / [dCurrent/dt] Magnetic flux density | Magnetic induction kg. s-2. A-1 Wb. m-2, T (tesla) [Mag. flux] / [Area] Magnetic induction kg. s-2. A-1 Wb. m-2, T (tesla) [Mag. flux] / [Area] . More properly magnetic flux density Magnetic intensity m-1. A [Current] / [Distance] . More properly magnetic field strength Magnetic moment m2. A J. T-1 [Current] ⚹ [Area] Magnetic permeability kg. m. s-2. A-2 H. m-1 [Mag. flux density] / [Mag. field strength] Magnetic permeability, relative 1 Dimensionless [Permeability] / [Permeability of vacuum] Magnetic quadrupole moment m3. A m. J. T-1 [Mag. dipole] ⚹ [Distance] Magnetic susceptibility 1 Dimensionless [Relative permeability] -1 Magnetic vector potential kg. m. s-2. A-1 m-1. s. V, m. T [Mag. flux density] ⚹ [Distance] , [El. field strength] ⚹ [Time] Magnetization m-1. A [Mag. moment] / [Volume] . Like magnetic field strength Magnetogyric ratio kg. s-1. A-1 T. Hz-1 [Angular moment of motion] / [Mag. moment] Magnetomotive force (mmf) A [Current] ⚹ [Number of turns] Magnitude of a star 1 Dimensionless m-m ′ =-100.4 (S/S ′ ) , where S, S ′ are the luminous fluxes of two stars Mass kg kg (kilogram) Mass density kg. m-3 [Mass] / [Volume] . Same as specific density Mass density gradient|Specific density gradient kg. m-4 [Mass density] / [Distance] Mass concentration 1 Dimensionless [Partial mass] / [Total mass] Mass flow (total) kg. s-1 kg [ΔMass] / [Time] . For example, through a device Mass production rate kg. s-1 [ΔMass] / [Time] . Same as mass flow Mass, molar kg. mol-1 [Mass] / [Quantity] Mass number of an isotope 1 Dimensionless Number of protons + neutrons in the isotope nuclide Mean anomaly 1 Dimensionless Of a body on a Kepler orbit; t. sqrt (G (M1 + M2) /r3) Mean motion s-1 Of a body on a Kepler orbit; sqrt (G (M1 + M2) /r3) Modulus of compression kg-1. m. s2 Pa-1 [Pressure] / ( [ΔVolume] / [Volume] ) . Same as compressibility Modulus of rigidity kg. m-1. s-2 N. m-2, Pa [Stress] / [Strain] . Same as shear modulus Mobility, ionic kg-1. m-1. s2. A m2. s-1. V-1 [Velocity] / [Electric field strength] . Molality (intended as concentration) kg-1. mol mol/kg [Quantity] / [Mass] Molar charge s. A. mol-1 C. mol-1 [Charge] / [Quantity] Molar concentration m-3. mol [Quantity] / [Volume] . Same as concentration or molarity Molar concentration gradient m-4. mol [Molarity] / [Distance] . Same as molarity gradient Molar concentration ratio 1 Dimensionless [Partial quantity] / [Total quantity] Molar conductivity, electric kg-1. m-3. s3. A2. mol-1 S. m-1. mol-1 [El. conductivity] / [Concentration] Molar density m-3. mol [Quantity] / [Volume] . Same as concentration Molar energy kg. m2. s-2. mol-1 J. mol-1 [Energy] / [Quantity] Molar enthalpy kg. m2. s-2. mol-1 J. mol-1 [Enthalpy] / [Quantity] . Like molar heat Molar entropy kg. m2. s-2. K-1. mol-1 J. K-1. mol-1 [Entropy] / [Quantity] Molar free energy kg. m2. s-2. mol-1 J. mol-1 [Free energy] / [Quantity] . Also molar Helmholtz function Molar free enthalpy kg. m2. s-2. mol-1 J. mol-1 [Free enthalpy] / [Quantity] . Also molar Gibbs function Molar heat kg. m2. s-2. mol-1 J. mol-1 [Heat] / [Quantity] Molar heat capacity kg. m2. s-2. K-1. mol-1 J. K-1. mol-1 [Heat capacity] / [Quantity] Molar internal energy kg. m2. s-2. mol-1 J. mol-1 [Internal energy] / [Quantity] . Like molar heat Molar mass kg. mol-1 [Mass] / [Quantity] Molar particle count mol-1 [Count] / [Mol] . For example, the Avogadro constant Molar production rate mol. s-1 [ΔQuantity] / [Time] . Molar refractivity m3. mol-1 [ (r2-1) / (r2 + 2) ] / [Concentration] , where r is the refractive index Molar relaxivity s-1. mol-1 [Relaxation rate] / [Concentration] Molar solubility m-3. mol [Quantity] / [Volume] . Same as concentration Molar volume m3. mol-1 [Volume] / [Quantity] Molarity m-3. mol [Quantity] / [Volume] . Same as concentration or molar density Molarity gradient m-4. mol [Molarity] / [Distance] . Same as concentration gradient Molecular quantum charge 1 Dimensionless [Charge of a molecule] / [Elementary charge quantum] Moment of force kg. m2. s-2 N. m [Force] ⚹ [Distance] Moment of motion kg. m. s-1 [Mass] ⚹ [Velocity] , [Mass flow] ⚹ [Distance] Multiple derivatives with respect to time s-p dp/dtp, ∂ p/ ∂ tp; for p = 1,2, 3, . . Multiple derivatives with respect to a length m-p dp/drp, ∂ p/ ∂ rp; for p = 1,2, 3, … , r = x|y | z Mutual inductance kg. m2. s-2. A-2 V. s. A-1, Wb. A-1, H (henry) [ΔPotential] / [dCurrent/dt] , [Mag. flux] / [Current]

## SI Dimensions of Physical Quantities: ‘N’ Alphabetic List

 N: Quantity Dimension Alternatives Definition/Notes Nabla (∇) | div|grad|rot|curl m-1 Any derivative-like construct with respect to a distance Notch resistance kg. s-2 J. m-2 [Energy] / [Area] Number of instances/events 1 This covers all kinds of enumerations Number density m-3 [Particles] / [Volume] . Obsolete; see particle density Number of turns 1 Often used in electric engineering

## SI Dimensions of Physical Quantities: ‘O’ Alphabetic List

 O: Quantity Dimension Alternatives Definition/Notes Osmotic pressure kg. m-1. s-2 Pa

## SI Dimensions of Physical Quantities: ‘P’ Alphabetic List

 P: Quantity Dimension Alternatives Definition/Notes Particle count, molar mol-1 [Count] / [Mol] . For example, the Avogadro constant Particle density m-3 [Count] / [Volume] . Obsolete: number density P/E Price/Earnings ratio s year [Value] / [Earnings] . Economy and finance Peltier coefficient kg. m2. s-3. A-1 W. A-1, V [Heat flux] / [Current] Perimeter|Circumference m Permeability, magnetic kg. m. s-2. A-2 H. m-1 [Mag. flux density] / [Mag. field strength] Permeability, hydraulic m2 1 darcy = 10-12 m2 [Velocity] ⚹ [Viscosity] / [Pressure gradient] , in porous media Permittivity, electric kg-1. m-3. s4. A2 F. m-1 [El. flux density] / [El. field strength] Permittivity, relative 1 Dimensionless [Permittivity] / [Permittivity of vacuum] . Dielectric constant Phase|Phase angle 1 rad φ typically in exp (i (ωt + φ) ) Phase drift rate s-1 rad. s-1 [Phase angle] / [Time] Pi coefficient, molar kg. m-1. s-2. mol-1 J. m-3 [ΔInternalEnergy] / [ΔVolume] Piezzoelectric coefficient kg. m. s-3. A-1 V. m-1 [Electric field strength] / ( [ΔLength] / [Length] ) Plane angle 1 rad Poisson՚s ratio 1 Dimensionless [Transversal striction] / [Londitudinal elongation] Polarization, electric m-2. s. A C. m-2 [Charge] / [Area] . Like electric flux density Porosity, superficial 1 Dimensionless [Void cross section] / [Total cross section] , in porous media Porosity, volume 1 Dimensionless [Pores volume] / [Total volume] , in porous media Position vector m in all Euclidean n-dimensional spaces Potential, electric kg. m2. s-3. A-1 W. A-1, J. C-1, V (volt) [Power] / [Current] , [Energy] / [Charge] Power kg. m2. s-3 J. s-1, W (watt) [ΔEnergy] / [ΔTime] . Equivalent to energy flux Prandtl number 1 Dimensionless [Kinematic viscosity] / [Thermal diffusivity] Propagation loss m-1 dB/m [Ratio] /m. Generic, usable for any quantity Poynting vector kg. s-3 W. m-2 [El. field strength] / [Mag. field strength] . Like irradiance Pressure kg. m-1. s-2 N. m-2, Pa (pascal) [Force] / [Area] Pressure gradient kg. m-2. s-2 N. m-3, Pa/m [Pressure] / [Distance] Price|Value cur currency Economy and finance Probability of an event 1 Real number in a dimensionless interval [0,1] Probability density on log-scale 1 Np-1 [Probability] / [Natural-logarithmic ratio] Purchase|Transaction value cur currency Economy and finance

## SI Dimensions of Physical Quantities: ‘R’ Alphabetic List

 R: Quantity Dimension Alternatives Definition/Notes Radiance kg. s-3. sr-1 W. m-2. sr-1 ( [Power] / [Area] ) / [Solid angle] Radiation dose m2. s-2 J. kg-1, Gy (gray) [Energy] / [Mass] Radiation dose rate m2. s-3 Gy. s-1 [Absorbed dose] / [Time] Radioactivity s-1 Bq (becquerel) [Counts] / [Time] Radius of curvature m of a line in plane/space or surface in space Rotational stiffness kg. m2. s-2. rad-1 N. m. rad-1 [Moment of force] / [Angle] … of a structure Ratio of commensurable quantities 1 Dimensionless Q1/Q2, with Q1 and Q2 having the same dimension Reactance, acoustic kg. m-4. s-1 Pa. s/m3, reyl/m2 [ΔPressure] / [Volume flow rate] . Also acu. impedance/resistance Reactance, acoustic, specific kg. m-2. s-1 Pa. s/m , reyl [ΔPressure] ⚹ [Velocity] . Also s. acu. impedance/resistance Reactance, capacitive kg. m2. s-3. A-2 Ω (ohm) 1/ (i [Angular frequency] . [Capacitance] ) Reciprocal space position|K-space vector m-1 Redox potential kg. m2. s-3. A-1 V (volt) Same as reduction potential Reduction potential kg. m2. s-3. A-1 V (volt) Same as redox potential Refractive index 1 Dimensionless Light speeds ration (in a medium) / (in vacuum) Refractivity, molar m3. mol-1 [ (r2-1) / (r2 + 2) ] / [Concentration] Refractivity, specific m3. kg-1 [ (r2-1) / (r2 + 2) ] / [Specific density] , Relative atomic mass | Atomic weight au atomic units Average over a typical isotopic composition Relative differential 1 Dimensionless dQ/Q, d {ln (Q) } , for any quantity Q. Also log-scale differential Relative evolution rate s-1 d {ln (Q) } /dt = (dQ/dt) /Q. Also log-scale evolution rate Relative permeability, magnetic 1 Dimensionless [Permeability] / [Permeability of vacuum] Relative permittivity, electric 1 Dimensionless [Permittivity] / [Permittivity of vacuum] . Dielectric constant Relative variation 1 Dimensionless ΔQ/Q, for any quantity Q Relativistic displacement four-tensor (Dμν) m-1. A Like magnetic intensity Relativistic electromagnetic field tensor (Fμν) kg. s-2. A-1 T Like magnetic flux density Relativistic four-current (Jα) m-2. A Like current density and [Charge] ⚹ [c] Relativistic four-potential (Aα) kg. m. s-2. A-1 m-1. s. V, m. T Like magnetic vector potential and [El. potential] / [c] Relaxation rate s-1 1/ [Relaxation time] . Used for returns to equilibria Relaxation time s Used for returns to equilibria Relaxivity, molar s-1. mol-1 [Relaxation rate] / [Concentration] Reluctance, magnetic kg-1. m-1. s2. A2 m. H-1 1/ [Permeability] Resistance, acoustic kg. m-4. s-1 Pa. s/m3, reyl/m2 [ΔPressure] / [Volume flow rate] . Also acu. impedance/reactance Resistance, acoustic, specific kg. m-2. s-1 Pa. s/m , reyl [ΔPressure] ⚹ [Velocity] . Also s. acu. impedance/reactance Resistance, electric kg. m2. s-3. A-2 V. A-1, Ω (ohm) [ΔPotential] / [Current] Resistance, thermal kg-1. m-2. s3K K/W of a device. [ΔT] / [Power] . Resistance to impact kg. s-2 J. m-2 [Energy] / [Area] . Like notch resistance Resistivity, electric kg. m3. s-3. A-2 Ω. m ( [Resistance] ⚹ [Length] ) / [Area] Return on asset/equity s-1 % /year ( [ΔValue] / [Value] ) / [Time period] . Economy and finance Reynolds number 1 Dimensionless [Velocity] ⚹ [length] / [Kinematic viscosity] RF attenuation m-1 dB/m [Ratio] /m. Used mostly for radiation

## SI Dimensions of Physical Quantities: ‘S’ Alphabetic List

 S: Quantity Dimension Alternatives Definition/Notes Sale|Transaction value cur currency Economy and finance Sales flow|Transactions volume cur. s-1 [Value] / [Time period] . Economy and Finance Seeback coefficient kg. m2. s-3. A-1. K-1 V. K-1 [ΔPotential] / [ΔTemperature] . Same as thermoelectric power Self-diffusion coefficient m2. s-1 [Distance2] / [Time] Settling rate s-1 typically dB/s [Ratio] / [ΔTime] Settling time s typically dB/s Used to describe transient phenomena Shear modulus kg. m-1. s-2 N. m-2, Pa [Stress] / [Strain] . Like Young modulus Softening point K Temperature at which hardness drops below a level Solid angle 1 sr (steradian) Solubility, molar m-3. mol [Quantity] / [Volume] . Same as concentration Sonic attenuation m-1 dB/m [Power ratio] /m. Used in acoustics Specific acoustic impedance kg. m-2. s-1 Pa. s/m , reyl [ΔPressure] ⚹ [Velocity] . Also s. acu. resistance/reactance Specific acoustic conductance kg-1. m2. s reyl-1 Also specific acoustic susceptance Specific charge kg-1. s. A C. kg-1 [Charge] / [Mass] . Charge/mass ratio Specific density kg. m-3 [Mass] / [Volume] . Same as density of mass Specific density gradient kg. m-4 [Mass density] / [Distance] . Same as mass density gradient Specific energy m2. s-2 J. kg-1 [Energy] / [Mass] Specific enthalpy m2. s-2 J. kg-1 [Enthalpy] / [Mass] . Like specific heat Specific entropy m2. s-2. K-1 J. K-1. kg-1 [Entropy] / [Mass] Specific free energy m2. s-2 J. kg-1 [Free energy] / [Mass] . Also specific Helmholtz function Specific free enthalpy m2. s-2 J. kg-1 [Free enthalpy] / [Mass] . Also specific Gibbs function Specific heat m2. s-2 J. kg-1 [Heat] / [Mass] Specific heat capacity m2. s-2. K-1 J. K-1. kg-1 [Heat capacity] / [Mass] Specific internal energy m2. s-2 J. kg-1 [Internal energy] / [Mass] . Like specific heat Specific refractivity m3. kg-1 [ (r2-1) / (r2 + 2) ] / [Specific density] Specific volume m3. kg-1 [Volume] / [Mass] Speed m. s-1 [Distance] / [Time] . Same as velocity Spin 1 Dimensionless of a quantum particle Star magnitude 1 Dimensionless m-m ′ =-100.4 (S/S ′ ) , where S, S ′ are luminous fluxes of two stars Stiffness, linear kg. s-2 N. m-1 [Force] / [Displacement] … of a structure Stiffness, rotational kg. m2. s-2. rad-1 N. m. rad-1 [Moment of force] / [Angle] … of a structure Strain (mechanical) 1 Dimensionless [ΔLength] / [Length] Relative deformation Strain point K Temperature at which viscosity drops below 1013.5 Pa. s Strength, compressive kg. m-1. s-2 N. m-2, Pa [Force] / [Area] . Like pressure Strength, dielectric kg. m. s-3. A-1 V. m-1 [ΔPotential] / [Distance] . Same as electric strength Strength, electric field | Electric intensity kg. m. s-3. A-1 V. m-1 [ΔPotential] / [Distance] Strength, ionic m-3. mol Sum ( [Concentration] ⚹ [Ionic quantum charge] 2) . Strength, magnetic field | Magnetic intensity m-1. A [Current] / [Distance] Strength, tensile kg. m-1. s-2 N. m-2, Pa [Force] / [Area] . Same as pressure Superficial porosity 1 Dimensionless [Void cross section] / [Total cross section] , in porous media Superficial velocity m. s-1 m/s In porous media; as if the space was filled only by the fluid Surface area m2 [Distance] ⚹ [Distance] . Applicable to 3D bodies Surface density of charge m-2. s. A C. m-2 [Charge] / [Area] Surface element m2 [Distance] ⚹ [Distance] . Same as area Surface energy kg. s-2 J/m2 [Energy] / [Area] . Same as surface tension Surface growth rate m2. s-1 [ΔArea] / [Time] Surface tension kg. s-2 N/m [Force] / [Length] . Same as surface energy Susceptance, acoustic, specific kg-1. m2. s reyl-1 Also specific acoustic conductance Susceptance, capacitive kg-1. m-2. s3. A2 S (siemens) 1/ [Reactance] Susceptibility, magnetic 1 Dimensionless [Relative permeability] -1 Stress kg. m-1. s-2 Pa, N. m-2 [Force] / [Area] . Same as pressure

## SI Dimensions of Physical Quantities: ‘T’ Alphabetic List

 T: Quantity Dimension Alternatives Definition/Notes Temperature K K (kelvin) Temperature gradient K. m-1 [ΔTemperature] / [Distance] . Same as thermal gradient Tensile strength kg. m-1. s-2 N. m-2, Pa [Force] / [Area] . Same as pressure Tension kg. m-1. s-2 Pa, N. m-2 [Force] / [Area] . Like pressure Thermal conductivity kg. m. s-3. K-1 W. m-1. K-1 [Heat flux] / ( [Distance] ⚹ [ΔTemperature] ) . Same as heat conductivity Thermal diffusivity m2. s-1 ( [∂ Temperatute] / [∂ Time] ) / [∇ 2Temperature] . Thermal expansion coefficient K-1 ( [ΔLength] / [Length] ) / [Temperature] Thermal gradient K. m-1 [ΔTemperature] / [Distance] . Same as temperature gradient Thermal resistance kg-1. m-2. s3K K/W of a device. [ΔT] / [Power] . Thermodynamic force kg. m. s-2. mol-1 N/mol [ΔChemical potential] / [Distance] Thermoelectric power | Thermopower kg. m2. s-3. A-1. K-1 V. K-1 [ΔPotential] / [ΔTemperature] . Same as Seeback coefficient Thickness m usually referred to planar structures Thomson coefficient kg. m2. s-3. A-1. K-1 W. K-1. A-1 [Heat flux] / ( [ΔTemperature] ⚹ [Current] ) Time s s (second) Torque | Moment of force kg. m2. s-2 N. m [Force] ⚹ [Distance] Traction kg. m. s-2 N (newton) Maximum tangential force before slipping Traction coefficient 1 Dimensionless [Traction] / [Weight] Transaction value|Sale|Purchase cur currency Economy and finance Transactions count 1 Dimensionless Economy and finance Transactions rate|Activity s-1 1/year [Transactions] / [Time period] . Economy and finance Transactions volume|Sales flow cur. s-1 [Value] / [Time period] . Economy and Finance Transmission loss m-1 dB/m [Ratio] /m. Generic, usable for any quantity

## SI Dimensions of Physical Quantities: ‘V’ Alphabetic List

 V: Quantity Dimension Alternatives Definition/Notes V-number | Abbé number | Constringence 1 Dimensionless VD = (nD-1) / (nF-nC) Value|Price cur currency Economy and finance van der Waals constant: a kg. m5. s-2. mol-2 Pa. m6 a in (p + a/V2) (V-b) = RT, where V is molar volume van der Waals constant: b m3. mol-1 b in (p + a/V2) (V-b) = RT, where V is molar volume Variance of current noise nJ2 s. A2 A2/Hz [Current] 2/ [Bandwidth] Variance of voltage noise nV2 kg2. m4. s-5. A-2 V2/Hz [Voltage] 2/ [Bandwidth] Vector potential, magnetic kg. m. s-2. A-1 m-1. s. V, m. T [Mag. flux density] ⚹ [Distance] , [El. field strength] ⚹ [Time] Velocity m. s-1 m/s [Distance] / [Time] . Same as speed Velocity, advection m. s-1 m/s In porous media; actual progress along pressure gradient Velocity, of money (circulation) s-1 1/year [Transactions] / [Time period] . Economy and finance Velocity, superficial m. s-1 m/s In porous media; as if the space was filled only by the fluid Verdet constant kg-1. m-1. s2. A1 rad. m-1. T-1 ( [Angle] / [Length] ) / [Magnetic flux density] Virial coefficient: second m3. mol-1 B in pV/ (nRT) = 1 + B (n/V) + C (n/V) 2 + D (n/V) 3 + … Virial coefficient: third m6. mol-2 C in pV/ (nRT) = 1 + B (n/V) + C (n/V) 2 + D (n/V) 3 + … Virial coefficient: fourth m9. mol-3 C in pV/ (nRT) = 1 + B (n/V) + C (n/V) 2 + D (n/V) 3 + … Viscosity, dynamic kg. m-1. s-1 Pa. s ( [Force] / [Area] ) / [ΔVelocity] Viscosity, kinematic m2. s-1 [Dynamic viscosity] / [Density] Voltage | Electromotive force kg. m2. s-3. A-1 V [ΔPotential] Voltage noise, variance nV2 kg2. m4. s-5. A-2 V2/Hz [Voltage] 2/ [Bandwidth] Volume m3 [Area] ⚹ [Distance] Volume concentration 1 Dimensionless [Partial volume] / [Total volume] Volume flow m3. s-1 [Volume] / [Time] . For example, through a device Volume growth rate m3. s-1 [Volume] / [Time] . For example, of a crystal Volume porosity 1 Dimensionless [Pores volume] / [Total volume] , in porous media

## SI Dimensions of Physical Quantities: ‘W’ Alphabetic List

 W: Quantity Dimension Alternatives Definition/Notes Wave function for N particles (quantum) m-3N/2 tentative | ψ| 2dτN is a dimensionless probability element. Wavelength m [Wave velocity] / [Frequency] Wavenumber m-1 [Number of waves] / [Distance] Wealth|Asset cur currency Economy and finance Work function kg. m2. s-2 J, eV [Energy] needed to remove an electron

## SI Dimensions of Physical Quantities: ‘Y’ Alphabetic List

 Y: Quantity Dimension Alternatives Definition/Notes Young modulus kg. m-1. s-2 N. m-2, Pa [Stress] / [Strain] . Like shear modulus

Developed by: