How is air in a scuba tank which is fixed and rigid get affected by the pressure of the water outside of the tank? Shouldn’t the volume of the air in the tank remain constant once as the tank does not get deformed (squished)?
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You’re correct the volume of air in the tank doesn’t change at depth. however to use it, the air must leave the rigid tank and go into the hose, the squishy person and their lungs. So it needs to push against the forces in the tube and then in the person and fill up their lungs, which have the same volume but now need more gas to equalize the pressure on the body.
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