Submarines dive by allowing water to expel air from their … tanks? How do they regain buoyancy in order to surface?
In: Engineering
By filling their tanks with air again, coming from compressed air containers.
Buoyancy depends on weight versus volume. It’s basically the same as blowing up a balloons with helium (but the other way around here as you force heavy water out of the tanks and replace it with lightweight air without changing your volume)
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