Drinking liqiuds using a straw, Atmopheric pressure, Physics
If the air is blocked off, would it be possible to drink from a straw This activity answers that question insert a straw into a bottle with some juice and suck from it to make sure that it is possible to drink the liquid. Then, use putty to seal off the gaps around where the straw enters the bottle, so that the inside of the bottle is totally cut off from the atmosphere outside. After doing this, it is impossible to drink water by sucking on the straw. It is atmospheric pressure that makes it possible to drink water from a straw sucking on the straw reduces the pressure inside it but more importantly, it sets up a pressure difference between the inside of the straw and the atmopherere outside. The atmosphere attempts to equalise the pressure by pushing down on the liquid, sending it rising up through the straw.
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