fill a glass with water and cover
it with coaster. Then invert the glass.
What will you observe? ?
Give reason.
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Answer:
The air inside the glass was originally at one atmosphere of pressure when you put the card over it, but when you inverted the glass and removed your hand, the water moved downward a very slight amount (perhaps making the card sag ever so slightly), thereby increasing the volume allotted to the air.
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