AIR PRESSURE

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DRINKING STRAW
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1. When air is sucked out from the drinking straw, the pressure inside the straw is .
2.The atmospheric pressure is than the pressure inside the straw. This pushes the water up into the drinking straw.
3.If there is a hole in any part of the straw which lies above the water level, the water cannot go up the straw.This is because the pressure inside the drinking straw and the atmospheric presure outside are the .