Each square meter of the earth's surface has about ten tons of air above it. the weight exerts some pressure at the ground which is called air pressure.
DIFFERENT PRESSURES - Different pressures are created according to the heat it receives from the Sun . More heat creates low pressure and vice- versa.
BAROMETER- It is the instrument used to measure air pressure . To types oh barometers are mercury barometer and aneroid barometer.
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