Like how do they choose to move from left to right or bottom to top
In: 1
Just pressure. The gas or liquid is at a high pressure at the source, so when a valve is opened, introducing a low-pressure enivronment, it moves toward low pressure.
For example, a propane tank. Propane is normally a gas at regular temps, but the propane in that canister is liquid. It is trying to go back to a gas, which creates pressure. This is what happens when you heat water in an enclosed container… it is at a temp where it wants to expand into a gas, but there isn’t enough room. Then, when you open the valve on the propane tank, suddenly there is a low pressure environment for the gas to expand into.
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