krw wrote:

Sure, 32psi is about 2ATM, so it will weight twice that of air at
0ATM (note: differential pressures). Air is mostly N2 and O2, so
it has a weight of, say 30g/mole (O2 is 32g/mole, N2 is 28g/mole).
At STP there are 22.4moles/l so that's about 375g/l. So, at 2ATM a
tire will weight about 750grams per liter of tire volume more than
it will deflated. That doesn't sound like it's going to to take a
tremendously accurate scale to measure. ;-)


Actually it is 22.4L/mole at STP; atmospheric pressure would be quite
great your way So 1 L of air at 2 atm would weigh about 2.7g.