NCERT Class 7 Geography Chapter 4: Air YouTube Lecture Handouts

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NCERT Class 7 Geography Chapter 4: Air

NCERT Class 7 Geography

Chapter 4: Air

Composition of Atmosphere

Composition of Atmosphere
Weather, Climate & Composition of Atmosphere - 11 Major Gases

Structure of Atmosphere

Layers of Atmosphere - 4 Layers in Thermal & 2 in Magneto-Electrical Structure
Structure of Atmosphere

Weather vs. Climate

  • Earth receives only 1 in 2, 000,000, 0000 parts of the sun՚s energy
  • Weather: hour to hour/day to day

Instruments

  • Thermometer: Temperature
  • Barometer: Pressure
  • Rain Gauge: Amount of Rainfall
  • Wind Vane: Direction of Wind

Temperature

  • Degree of hotness or coldness of air
  • Temp Change b/w day & night, season to season (Summers are hot)
  • Insolation: Incoming Solar Radiation
  • Equator to Poles
  • High Temp in Cities: Concrete, Cement, Asphalt – Trap Heat
  • Standard unit of measuring temperature is degree Celsius
Temperature - Insolation, Heat Transfer, 3 Lapse Rate & 4 Scales in Climatology

Pressure

  • Pressure exerted by the weight of air on the earth՚s surface
  • Pressure with height (Max. at sea level)
  • Distribution – Horizontally
  • Air heats & rise – High Temp. – Creates LP – Cloudy & Wet
  • Low Temp. – Air is cold, heavy, dense, sinks – HP – Clear & Sunny Skies
High Pressure and Low Pressure
Watch: Temperature - Insolation, Heat Transfer, 3 Lapse Rate & 4 Scales in Climatology
Winds - Coriolis Effect, 3 Planetary and Local Winds in Climatology
Cool Water and Warm Water

Moisture

Cyclonic Rainfall, Relief Rainfall and Convectional

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