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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The air decompresses to the pressure of the environment it is being released into. Decompression = expansion. The deeper you are, the higher the pressure in the environment, so the less the air has to decompress to match it. This means, to fill your lungs (which are always the same size), it takes more air, i.e. air that has not expanded as much as it would at the surface. Or you could say it takes denser air. More air molecules packed into the same space.
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