![]() ![]() ![]() The manufacturer of the 97 cf tank says "97 cubic ft (or 550 cubic inches)": ( Air Tanks For Sale Discounts for PCP (Pre-Compressed-Pneumatic) Air Gun by AirTanksForSale ) I think I discovered the source of my confusion. The specific question comes from paintball, which is the reason for the smaller 13 cubic inch tank, but I figured that the math behind it relates equally well to scuba This seems insanely high, so I'm assuming I made a math or logic error.can anyone sanity check me here? So, my "real" volume of air (before getting down to 3000 psi) is actually 0.33*145.5 = 48 However, I wan't to ignore the air once it gets down to 3000 psi, so I have to calculate the volume of air left at 3000 psi: Therefore, each time I refill, I am adding back 0.33*0.00752315 cf = 0.0024826395 cf at 3000 psiįor the big tank, using the ideal gas law, I compute the equivalent storage capacity at 3000 psi. This means that if I run it down to 2000 psi, then I have 13/19.5 or 66% air left.which means I used 33% of the original air. On the small tank, using the ideal gas law, I first compute the volume of air if reduced to 2000 psi: How many times can I refill it to 3000 psi?įor the small tank, 13 ci * (1 cf/1728 ci) = 0.00752315 cf Every time the little tank gets down to 2000 psi, I refill it from the big tank. Suppose I have a 97 cf tank at 4500 psi, and a 13 ci tank at 3000 psi. ![]() The confusion below arises from the fact that it's not actually a 97 cf tank, it's a 550 cubic inch tank (that could hold up to 97 cubic feet of uncompressed air) ![]()
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