Air pressure is also known as atmospheric pressure. How is it caused?

By the heat energy in the air

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By the wind that blows in the air

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By water vapour in the air

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By the air around us that presses on the surfaces of objects

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Solution

The correct option is D By the air around us that presses on the surfaces of objects
The pressure exerted by air around us is known as atmospheric pressure.
If we imagine a unit area and a very long cylinder standing on it filled with air, then the weight of the air in this cylinder is the atmospheric pressure.

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Question 9

Fill in the blanks.
(i) Air around us exerts___
(ii) The moving air is called ___
(iii) The main cause of wind movement is uneven ___ on the earth.
(iv) High speed wind can cause cyclone in regions of ___ pressure

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