Fill a glass of water upto the brim put sand what will happen
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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.
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When we mix sand and water, no reaction takes place. The sand simply settles down at the bottom of the water container. This is because sand is heavier than water and hence cannot float in water.
But if we add some salt or sugar , then the reaction takes place and the water also becomes salty or sweet.
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