eml 3100 lec 6 - Thermodynamics What do we do if gases...

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Lecture No. 6 1 UNIVERSITY OF FLORIDA Thermodynamics What do we do if gases cannot be treated as ideal? We use a “fudge factor” to make it work. We call this factor the compressibility factor, z The equation of state becomes: Pv = zRT Where z = v actual /v ideal , z =1 for an ideal gas. So how do we find the factor z? Experimentally? See section 3.7 of your text.
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Lecture No. 6 2 UNIVERSITY OF FLORIDA Thermodynamics We use the concept of “reduced pressures” and “reduced temperatures” to model compressibility factors. P r = P/P critical and T r = T/T critical Note: use absolute pressure and absolute temperatures Through experimental observation, we have noted that the z factor for all gases is approximately the same for the same reduced pressure and temperature. This is called the “principle of corresponding states.” See the figures in your text for this correlation. Your text emphasizes the use of fig. D.1 based on the work of Lee and Kesler. The next fig. is based on Nelson and Olbert’s work.
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Lecture No. 6 3 UNIVERSITY OF FLORIDA
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Lecture No. 6
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eml 3100 lec 6 - Thermodynamics What do we do if gases...

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