Question

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?

Answer 1

Answer: The Diver's air tank is filled with oxygen gas.

The filling of air tank while keeping in water can be explained in reference to the Charles' Law.

Charles' Law: It states that the volume of the ideal gas is directly proportional to the absolute temperature at constant pressure.

                        $V\propto T$    (at constant Pressure)

The Scuba tank contains cold water and is present at high pressure. The gas which is put in the tank will be compact and would not expand. As the temperature is low inside the tank, hence by using Charles' Law, the volume will also decrease inside the tank.

When the air tank is filled, it is always kept in a tub of water because the pressure is high and hence, more oxygen gas can be filled inside the air tank.

Answer 2

The reason for placing the tank in the water is to know that the tank's temperature will be the same as the water's and will remain constant, as well as the tank's volume.

What is the Charles' Law?

Charles' law states :

If the pressure remains constant, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature.

Thus, the air tank is always kept in a tub of water while it is filled because the pressure is high, and thus more oxygen gas may be filled inside the air tank.

Learn more about Charles' law, here:

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