don Francisco
Contributor
It's the same amount of air but assuming it held 3000psi at 82 degrees, the pressure at -18F, (100 degrees colder) would be almost 20% less. It will draw some heat from the regs and lines beyond what it normally draws during expansion, so don't dive cold water with it, and it might still be cooler than normal by the time you breathe it.
No problem otherwise, but the tank will probably accumulate some frost when you bring it into the humidity of the pool room. Suit up in advance, it might be a cool photo op.
BTW- you might have hit on the solution to chronic short fills -- fill all your tanks outdoors at 18 below.
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