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Air Volume Change with Pressure

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Old   December 8, 2000, 16:55
Default Air Volume Change with Pressure
  #1
Walt Muller
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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
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Old   December 10, 2000, 05:51
Default Re: Air Volume Change with Pressure
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John C. Chien
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(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).
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Old   December 11, 2000, 10:24
Default Re: Air Volume Change with Pressure
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Walt Muller
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Thanks John I'll try the thermodynamics texts.

Walt Muller
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Old   December 12, 2000, 08:09
Default Re: Air Volume Change with Pressure
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Rich E
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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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