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By W. Ennis

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APPLIED THERMODYNAMICS 28 Hirschfeld (6), in physical state that the perfect gas as a substance existing in such a The coefficient constituent particles exert no interattraction. 7 to Charles law, would be the exact reciprocal of the abso- fact, defines its of expansion, according lute tempeiature of melting for 1 ice, all pressures and temperatures. Zeuner has of the theory of perfect gases it can be (7) that as necessary consequences proved that the product of the molecular weight and specific volume, at the same shown pressure and temperature, principle (Art.

20. In a mixture of 5 Ib. of air with 1C Ib. of steam, at a pressure of 50 Ib. , what is the value of R for the mixture ? What is its equivalent molecular weight ? The difference of k and I * The partial pressure due to air only ? A mixed gas weighing 4 Ib. contains, by volume, 35 per cent of CO, The pressure ib 50 Ib. II and 3 poi cent of CH the balance being N. 21 of 4, 16 per cent per square inch and the temperature 100 F. Find the value of E for the mixture, the partial pressure due to each constituent, and the percentage composition by weight.

50, in R is a constant which ering air as perfect, its and T the absolute temperature. 36 foot-pounds. R PV+ R For other gases treated as perfect, fche value of may be readily calculated when any corresponding specific' volumes, pressures, and Under the pressure and temperature just temperatures are known. 20. 75; of oxygen, 7 may be derived from that just given by noting that _PF"-*- 2 = -B, a ; A constant ]PV : pv IF** 52. Significance of ' t At the standard ff. pressure and temperature E for various gases are obviously specified in Art.

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