I know that if you are inside of a hermetic room, the pressure is the same. But I can’t understand *why*. For example, if you enclose water from the bottom of the ocean in a box, shouldn’t it be suddenly at the same pressure than outside, due to the fact there is not the weight of the water column above ?
Thanks!
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Imagine the water is a spring. You push down on it, squeezing the spring smaller, then you take the now-small spring and shove it in a box that’s barely any bigger than the squished spring.
Even though you aren’t pushing down on the spring, it’s still stuck in its compressed state because the box is holding it that way. Opening the box would release the pressure (uncompress the spring) but as long as the box is small enough that the spring doesn’t have room to decompress it will stay at its current pressure.
Water works the same way.
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