Atmospheric Pressure and Winds — Syllabus
ICSE · Class 11 · Geography
What Atmospheric Pressure and Winds covers in ICSE Class 11 Geography: 4 topics, for the 2026-27 session. Part of the ICSE Class 11 Geography syllabus.
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Topics in Atmospheric Pressure and Winds
Atmospheric Pressure: Meaning, Measurement, and Importance
- Atmospheric pressure is the pressure exerted by the atmosphere on the earth’s surface.
- Air has weight, so it presses on the surface below it.
- Atmospheric pressure is measured with a barometer.
Factors Affecting Atmospheric Pressure
- Temperature and pressure are inversely related: when temperature rises, air expands, becomes lighter, and pressure falls.
- When temperature falls, air contracts, becomes denser, and pressure rises.
- Altitude reduces pressure because air is compressed more in lower layers than in upper layers.
Global Pressure Belts and Their Seasonal Shift
- There are seven pressure belts over the globe.
- Equatorial low pressure belt extends up to 10°N and S of the equator.
- Sub-tropical high pressure belts extend from near the tropics to about 35°N and S.
Winds and Their Controlling Factors
- Wind is the horizontal movement of air.
- Air current is the vertical or nearly vertical movement of air.
- Wind moves from high pressure to low pressure.
Key Concepts
Central concept: Atmospheric pressure and winds as linked elements of the atmosphere shaped by temperature, rotation of the Earth, pressure belts, air masses, fronts, cyclones, anticyclones, and jet streams
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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