Example - Volume from Steam Tables










From the corresponding state principle by considering Z as a function of (Tr, Pr) estimate the volume of 1 kmol of oxygen at 200 K and 6 x 106 N/m2.  (Pc = 5.05 x 106 N/m2; Tc = 155 K). Z values for various Tr, Pr are as given below:

Z

Tr               \( \downarrow \)Pr \( \rightarrow \)

0.8

1.0

1.2

1.5

1.1

0.7649

0.6880

0.5984

0.4580

1.2

0.8330

0.7858

0.7363

0.6605

1.3

0.8764

0.8438

0.8111

0.7624

1.4

0.9062

0.8827

0.8595

0.8256

1.5

0.9278

0.9103

0.8933

0.8689

First by considering the interpolation at fixed values of Pr, get Z; then at fixed Tr value get the Z.

That way, you will get Z as 0.807