What is the weight of air in a 30 gallon tank at 100 PSI?

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The weight of air in a 30-gallon tank at 100 PSI can be calculated using the density of air and the ideal gas law. At sea level, the density of air is approximately 0.075 lb/ft³, and there are 7.46 gallons in a cubic foot. This translates to about 2 pounds of air in the tank when fully pressurized. Therefore, the additional weight of the air at 100 PSI adds roughly 2 pounds to the tank's total weight. Understanding these calculations can help in managing the logistics of moving heavy equipment like air compressors.
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Some friends and I were moving a 30 gallon air compressor and after we moved it decided it would have been better to let the air out first. I would like to know how much more the tank weighs with it full of air at 100 PSI. Is there a simple formula to use to make this calculation?

Thanks so much for your help.
Shawn Boyers
 
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Well, the density of air at sea level pressure (14.7 psi) is .075 lb/ft^3 and there are 7.46 gal/ cu ft...
 
Ideal gas law...
 
2 pounds :smile:
 

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