Question

How atmospheric pressure helps in drinking liquid with a straw?
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Answer 1

Answer:

A drinking straw is used by creating suction with the mouth. This causes a decrease in air pressure inside the straw. Since pressure acting on the surface of the drink is equal to atmospheric pressure, so this greater pressure pushes the soft drink up the straw into the mouth.

Answer 2

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When you suck the air out of the straw, you decrease the pressure inside the straw, allowing the higher pressure on the rest of the surface to push the tea up the straw and into your mouth. Because it is really the atmosphere that is doing the pushing, the atmospheric pressure limits how high water will go up a straw.