What is it that stops liquid flowing out of a straw when then top is covered?
In: Physics
With a bit of air between the liquid and your finger (or whatever is covering the other end) it creates a little vacuum. Theres definitely a limit, but the weight of the liquid falling out is less than how much it would take to change the pressure of the little bubble of air. If your finger isn’t there, there is no vacuum as new air can come in from one end of the straw and replace the air that travels down the straw following the liquid out of the other end.
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