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What happens when we suck in water from a drinking straw that has a hole in it?And why?

Let’s first see what happens when we “suck” in water using a straw. We are actually reducing the pressure inside the  mouth. When we do not suck, the pressure on the surface of water and inside our mouth will be the same.

The Physics of Drinking with strawBut when we start to suck, the pressure inside the mouth is reduced and water is pushed into our mouth due to the greater pressure on the surface of water caused by the atmosphere.

If there is a hole, we are not able to produce a low pressure area inside our mouth by sucking in.

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