# Air Volume Change with Pressure

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 December 8, 2000, 16:55 Air Volume Change with Pressure #1 Walt Muller Guest   Posts: n/a I have a simple question. All the text books and websites seem to deal with far more complex issues, so I can't find the simple answer. If I take a cubic inch of air and compress it at 120 psi, what is the resulting volume? Delta T is zero for this case. Simple as that. Any takers? Thanks. Walt Muller

 December 10, 2000, 05:51 Re: Air Volume Change with Pressure #2 John C. Chien Guest   Posts: n/a (1). Why not check out a book on "Engineering thermodynamics" or books on IC engine thermodynamics. (2). On the p-v diagram, it is an iso-thermal compression from (p1,v1) to (p2,v2).

 December 11, 2000, 10:24 Re: Air Volume Change with Pressure #3 Walt Muller Guest   Posts: n/a Thanks John I'll try the thermodynamics texts. Walt Muller

 December 12, 2000, 08:09 Re: Air Volume Change with Pressure #4 Rich E Guest   Posts: n/a The property you need to find (in an enginnering handbook) is the compressibility of air. There are two values, the isothermal compressibility and the isentropic compressibility depending on the process. They are defined as tau = -(1/v) x (dv/dp) so you know dp (change in pressure) you know v (initial volume) hence dv (change in volume)

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