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What is How Deep to Keep a Handkerchief Dry about?

The document describes an experiment to keep a handkerchief dry underwater using a cup of air. Pushing the cup underwater traps a pocket of air that stays dry. Calculations using the ideal gas law show that compressing the air to fill 200mL of the original 250mL would create enough pressure at a depth of 2.58 meters to force the air into the cup and wet the handkerchief.

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