Aman took a glass filled with water. He covered it with a cardboard and held it tightly .He then turned the glass upside down quickly .After some time, he gently removed his hand from the cardboard. He observed that cardboard stayed in its place. Explain the reason behind this observation
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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.
Explanation:
Air exerts pressure - Ans
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