what makes a coaster placed over the rim of a glass of water stick even when you invert it?
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7
the air from surrounding force the coaster.
the outer aur responsible for that.
the outer aur responsible for that.
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4
Atmospheric pressure.
Normal air pressure is about 15 pounds per square inch.
The mouth of a glass might be about 4 square inches, so the air is pushing up on the coaster with a force of about 60 pounds.
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