* Imagine a large tank of water with a spigot at the bottom.
* When the spigot is closed, nothing happens.
* The tank doesn’t explode from pressure.
* When you open the spigot, the water starts to flow out of it.
* When you close it again, the water stops and nothing explodes.
* The water system in your home, in most cases, works exactly the same way, just on a very very large scale.
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