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Take a glass and fill it up with water up to the brim. Make sure that there are no air bubbles. Take a thick, stiff piece of cardboard and put it over the glass. Place your hand over the card and quickly turn the glass upside down. Now slowly remove your hand.
What does this experiment show?

A
Air occupies space.
B
Air exerts pressure
C
Air has weight
D
All of these
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Solution
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Correct option is B. Air exerts pressure
When you will remove your hand, you will find the card stays in place and the water does not flow out. This is because air exerts pressure on the card from below to keep the card in place. Here, the pressure exerted by air upwards is more than the pressure exerted by water downwards.

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