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    Why does water stay indide a straw when i cover the top?

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Here are some friends with simlar question as we.And I have this question for many days,anyone help us?
Kitty said: Yes.Why does water stay indide a straw when i cover the top?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(Why does water stay indide a straw when i cover the top?),it will help you,my kids.


Question:
Why does water stay indide a straw when i cover the top?

Answer:
Because pressure. If you cover the top if the water came down a vacuum keeps it there as no air can enter though the top.
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