Properties of air

AIR AROUND US Chapter 15 Class VI

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Air is present all around the earth in the atmosphere. Air is a heterogeneous mixture of different gases. The gases present in air are –Nitrogen (78.1 %), Oxygen (20.9 %), Carbon dioxide gas (0.038%) and rest other gases lie Argon, Water Vapour etc. (1%).

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WINDS, STORMS AND CYCLONES Class 7 Chapter 8

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The blowing air is called as wind. Storms are the very high speed winds. When thunder and lightning occurs with storms, it is called as thunderstorm. Cyclone is a very high speed wind revolving around a low air pressure system. The central low air pressure system is called as ‘eye of cyclone’.

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