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

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Image of Composition of Atmosphere

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Weather, Climate & Composition of Atmosphere - 11 Major Gases

Structure of Atmosphere

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

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Image of Structure of Atmosphere

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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

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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

Image of High Pressure And Low Pressure

Image of High Pressure and Low Pressure

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Watch: Temperature - Insolation, Heat Transfer, 3 Lapse Rate & 4 Scales in Climatology

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Winds - Coriolis Effect, 3 Planetary and Local Winds in Climatology

Image of Cool Water And Warm Water

Image of Cool Water and Warm Water

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Moisture

Image of Cyclonic Rainfall , Relief Rainfall And Convectiona …

Cyclonic Rainfall , Relief Rainfall and Convectional Rainfal …

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