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Question

How the straw works in sucking liquid 


Solution

There is no such definite force.
When you pull air out of the straw into your mouth, you lessen the atmospheric pressure inside the straw and create a void in it.
This void cannot remain like that... it must be filled. 
​Since, the outer atmospheric pressure is more now than the atmospheric pressure inside the straw... the outer pressure forces the liquid into the straw to fill that void . That is how the liquid goes into the straw.

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