[ELI5] why does plugging one end of a straw not let the water out of the other end when held up?
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Literal ELI5:
The water in the straw tries to start falling down, but as it starts to fall there’s nothing left above it to fill the gap where it was. There can’t be *nothing* there, so the water has to stay up in the straw until something else can go in that gap.
If you let go or poke or squeeze the straw so that some more air will be able to get in above the water, the water will be allowed to fall.
Most of the time on Earth there can’t be *nothing*, and there always has to be something like a air, water or other things. When there is a place with nothing we call it a vacuum. They exist when humans make them, like in a vacuum cleaner or other things that ‘suck’ things up. Away from Earth, except for planets and stars space is all a vacuum.
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