Atmospheric Pressure and Winds — Chapter Summary
ICSE · Class 11 · Geography
Summary of Atmospheric Pressure and Winds for ICSE Class 11 Geography. Part of the ICSE Class 11 Geography syllabus.
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Overview
Atmospheric pressure is the force exerted by the weight of air on the earth's surface. Changes in pressure create winds, which move from high pressure to low pressure. Temperature, altitude, water vapour, gravitational pull, and the rotation of the earth all influence pressure and wind movement. The
Key Concepts
Atmospheric pressure is the pressure exerted
Atmospheric pressure is the pressure exerted by the atmosphere due to the weight of air above a place. Standard sea-level pressure is 76 cm or 760 mm
An isobar is an imaginary line
An isobar is an imaginary line joining places having equal atmospheric pressure reduced to sea level. Pressure gradient is the rate of decrease in pre
Temperature
Temperature, altitude, water vapour, gravitational pull, and earth's rotation affect atmospheric pressure. Warm air is lighter and gives low pressure,
There are seven pressure belts
There are seven pressure belts: equatorial low, sub-tropical highs, sub-polar lows, and polar highs. Equatorial low and polar highs are thermally indu
Coriolis force is the deflecting force
Coriolis force is the deflecting force produced by the earth's rotation. It is zero at the equator and maximum at the poles. Winds are deflected to th
Learning Objectives
- Understand the meaning and measurement of atmospheric pressure.
- Explain the main factors that affect atmospheric pressure.
- Describe the vertical and horizontal distribution of atmospheric pressure.
- Identify the seven pressure belts and their seasonal shift.
- Explain the origin and direction of winds, including Coriolis force and pressure gradient force.
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