Ed, or Bill, or somebody; help me out here.  I was reviewing my calcs for air flow requirements, and find I used 0.02 Btu/cu. ft –F for the specific heat of air.  I don’t know where that came from, and can only find it in joules/Kg – K.  By the time I do all the conversions to British units and mass to volume I now get quite a different number.

What is a good number for air at about 1 atmosphere and, say 90F; in Btu per cu ft per degree F?

Thanks,

Al