when you drink a soft drink with the help of a straw what forces the liquid to rise up in the straw?

@ Shilpa: Good!

When we suck the air out of the straw through our mouth, vacuum is created inside the straw. The atmospheric pressure (which is higher than the vacuum) outside, thus, pushes the liquid into the low pressure straw. Thus the liquid reaches our mouth and we are able to drink.

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obviously air and pressure.

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