Most full scuba tanks have a pressure of between 1,800 p. s.i. and 3,000 p. s.i. (pounds per square inch). approximately 70 to 85 cubic feet of air has been squeezed into the tank. when a diver takes his air tank to be refilled, the dive shop will hook his tank to a compressor with a pressure hose and place his tank in a tub of water while it is being filled. what reasons can you give for placing the tank in water?

I would think that because water has a high specific heat, the water in the tank must be cold. Because the scuba tank is at high pressure, and the water is cold, the gas put into the tank will be more compact, and will not expand. According to Charles' law, as temperature increases, volume increases and because in this situation temperature is decreasing, volume will decrease. It would be great to keep the tank into the water because under these conditions, you can store more oxygen into the tank per square inch.

I hope this helps:)