Why water does not fall when we turn glass up side down or when we make glass horizontal?
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Answer:
The water forms an airtight seal around the top of the cup. Because of this, gravity, pulling the water down, works to increase the volume of air inside the cup. But because the cup is sealed, no new air can fill in this new space, so the pressure decreases. This reduced air pressure makes an imbalance in force.
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Answer:
The reason this experiment works is because of air pressure! Air pressure is the weight of a column of air pushing down on an area. ... Because of the air pressure pushing up on the card, the card will stay on the glass and the water will not spill out.
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