Why are scuba tanks filled in water

Why are scuba tanks filled in water? (7 key questions answered on air fills)

The reason why scuba tanks are filled in cold water is that a warm dive tank holds less air at a given pressure than a cool scuba tank does at the same pressure. This means that as the air inside the tank cools, the pressure of the air will decrease. Therefore by controlling the temperature of the dive tank during the filling process will increase the amount of air available when the tank is used on the next dive.

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