Why put a bottle of water when diving reload?
If the diver takes his air tank to be reused, the dive shop hook the tank to a compressor with a pressure hose and put your car in a bathtub full of water while filling … Why?
Water conducts better heat than air. When the tank is filled, air is forced into the cylinder. The air can be compressed, but when it is packed and the heat is generated in the process. Water will out the heat out of the bottle 20 times faster than cold air. Ideally, it should be placed on the movement of water means water cooling, but that is expensive to make. As the previous poster said, the tank is cooled, there is less pressure than was recorded during the initial filling. For every degree of temperature change + or gain or lose than 50 psi of pressure. The next time you dive in the islands, said that the pressure in the tank after switching regulator. If the tank has been in the sun during the hot day, you will notice that psi is a little higher than usual 3000PSI (aluminum cylinder 80), when you enter and begin to look down pressure again. You will notice a dramatic decrease of almost psi because water conducts heat away from the bottle much faster than in air environment
PADI Open Water Scuba Diving Course, Kingston ON
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