Like how do they choose to move from left to right or bottom to top
In: 1
Fluids (gas and liquid) move from high pressure to low pressure.
To get a fluid to move through a pipe you either shove more in at one end to increase pressure at the end you want it to flow from (water pipes, gas mains), or you suck some out at the other end to decrease pressure at the end you want it to flow to (vacuum cleaner, vacuum tube delivery systems)
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