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Can anyone tell me what this means?

I'm trying to find the adiabatic expansion coefficient in order to use this air compressor calculator.

http://www.engineeringtoolbox.com/horsepower-compressed-air-d_1363.html

These are the variables I have at the moment.....

Number of stages- 1

absolute initial pressure (psi)- 14.5

volume of compressed air at atmospheric pressure (cfm)- 20

absolute final pressure (psi)- 100.

So what is this adiabatic expansion coefficient and how can I calculate for it?

Thanks.

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# Homework Help: What is an Adiabatic Expansion Coefficient?

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