When you block one end of a straw why does the liquid stay in place/in the straw?
In: Physics
Simply because the forces on the liquid are at equilibrium. The weight of the fluid being pulled by gravity is equal to the force pushing up from the air pressure on the only open end of the straw (the bottom end).
When you release your finger, the pressures on both open ends is equal but you’re still left with gravity pulling the water down – so it leaves the straw.
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