Winds

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Atmospheric pressure is the pressure exerted by the weight of air in the atmosphere on the earth's surface. It is caused by Earth's gravitational force acting on the air molecules. The standard atmosp

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As altitude increases, atmospheric pressure decreases because air becomes thinner at higher altitudes. The pressure decreases by 1 cm or 13.32 millibars for every 165 metres of height gained. This is

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1. North Polar High Pressure Belt (80°N-90°N) 2. North Sub-Polar Low Pressure Belt (60°N-70°N) 3. North Tropical High Pressure Belt (20°N-30°N) 4. Equatorial Low Pressure Belt (5°N-5°S) 5. South Tropi

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The Equatorial Low Pressure Belt forms because: 1. Sun's rays fall vertically, causing high temperatures 2. Warm air expands, becomes light and rises 3. High humidity reduces air density It is also ca

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Wind is air that moves horizontally from high pressure areas to low pressure areas. Air current is air that moves vertically (upward or downward). The direction and velocity of wind depend on the pres

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Ferrell's Law states that winds are deflected due to Coriolis force: - In Northern Hemisphere: winds deflect to their RIGHT - In Southern Hemisphere: winds deflect to their LEFT This deflection is cau

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Trade Winds are permanent winds that blow from Tropical High Pressure belts toward the Equatorial Low Pressure belt. They are called 'Trade Winds' because they blow steadily in the same direction with

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Westerlies blow from Tropical High Pressure belts toward Sub-Polar Low Pressure belts. In the Southern Hemisphere, they have special names due to their intensity: - Roaring Forties (40°S) - very stron