The Cartesian Diver works because the pressure you impose on the closed
system compresses the air in the bottle (water does not compress), including the
air in the diver (whether it be in a condiment packet or in a modified eye dropper).
The compression of the air makes it more dense because you are forcing the
amount of air in the bottle (and diver) into a smaller space. In order for your diver
to sink, the density of the diver needs to become greater than the density of
water. The more dense the air becomes, the further the diver will sink.
Boyle’s Law: P1V1=P2V2 is also applied in this experimaent
relationship of pressure and volume of an ideal gas (constant temperature and
quantity)
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