Winds
Gujarat Board · Class 11 · Geography
Quick revision notes for Winds — Gujarat Board Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Atmospheric Pressure
- Atmosphere is the sphere of air spread over thousands of kilometres above Earth's surface
- Air has weight and exerts pressure on Earth's surface due to gravitational force
- Standard atmospheric pressure at mean sea level: 76 cm = 30 inches = 1013 millibars
Factors Affecting Atmospheric Pressure
- Three main factors: Altitude, Temperature, and Humidity
- Higher altitude = Lower pressure (air becomes thinner)
- Higher temperature = Lower pressure (air expands and becomes lighter)
Pressure Belts
- Seven pressure belts exist on Earth's surface
- Belts are arranged latitudinally with alternating high and low pressure
- Northern Hemisphere: Polar High (80°-90°N), Sub-polar Low (60°-70°N), Tropical High (20°-30°N)
Types of Winds - Permanent Winds
- Also called Planetary Winds - blow consistently from same direction
- Three types: Trade Winds (Easterlies), Westerlies, and Polar Winds
- Trade Winds: Blow from Tropical High to Equatorial Low (NE in NH, SE in SH)
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What are the important topics in Winds for Gujarat Board Class 11 Geography?
Winds covers several key topics that are frequently asked in Gujarat Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Winds — Gujarat Board Class 11 Geography?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
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