Propane tank volume

Boom! The classic potato gun harnesses the combustion of flammable vapor.
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metalmeltr
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Does anyone know, or can you find the volume in cubic inches of a 20lb propane tank, iwant to use it as a combustion chamber in a tennis ball/ pop can cannon. I have the tank, need to get some 2.75" exaust pipe.
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Crna Legija
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I think its about 915 cubic inches. In liquid idk how much in gas.
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Technician1002
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The volume is stamped on the handle with the test date on USA tanks. Look for the WC number. WC stands for Water Capacity. If filled full of water, this is the weight in pounds of the water in the tank. You can google coversions from pounds of water to other measures such as gallons, cubic inches, cubic feet, liters, etc.

I am not sure if the EU uses the same measurements. This is for DOT (department of transportation) refillable tanks.

Edit; A google search brought up the info for metric tanks as well.
http://metrology.burtini.ca/calc_lpg.html
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