The general relation is PV = MRT, where

P   pressure in lbs/sq.ft.
V   volume in cubic ft.
M   mass in lbs, ~ .0807 lbs/cu.ft. for air, IIRC
R   gas constant, 53.34 for air
T   absolute temp in degrees Rankine (deg F + 460)

regards, Jack

John Pearson wrote:
>
> I made a mistake with my question. I don't want to change the oxy/nitrogen
> ratio of air, but I am wondering how compressable is air.
>
> If I compressed air at 70 degrees F into a bottle and obtained 100psi with
> the air temp at 40 degrees F, will I have doubled the oxy/nitro density of
> the air. What kind of compression ratios am I capable of?

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