I see people put one end of a tube in some water and then suck the other end, and then the water seems to flow out of the tube on its own? Shouldn’t there be an external force pulling the water out?
In: Physics
There is an external force pulling the water out, gravity. The weight of the little bit of water in your tube that is below the waterline of your reservoir will pull the next bit of water up and over the bend of tube on its way out, which pulls the next bit of water and so on, creating flow.
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