PADI - Diving

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Air volume underwater: Volume changes proportionally with pressure.

If you descend to 10m, you double the pressure (  at sea level) so 2 bar, and halve the volume.

20m, tripple it so 3 bar, then you have a third volume. 

Density:
When you double the
presssure and halve the air volume, the volume reduction comes from squeezing the same amount of air molecules into half the space. Therefore the density doubles! 

0 m     1 bar   1 air volume     x1 density    container = FULL
10 m    2 bar   1/2 volume      x2 density     cont. = 1/2 FULL
20m     3 bar    1/3 volume     x3 density     cont.

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