E2.3 Compressibility Factor

Example 2.3: Find compressibility factor and the specific volume of nitrogen at 80 bar and 100 °K. The following data are applicable: T_c = 126.05 °K, P_c = 33.5 atm, ω = 0.047

Solution

Pressure, P = 80/(1.01325) = 78.95 atm

Reduced pressure, P_r (Equation 2.3):

Reduced temperature, T_r (Equation 2.4):

Z^(o) (Figure 2.2) = 0.4

Z⁽¹⁾ (Figure 2.3) = -0.16

Compressibility factor, Z (Equation 2.7):

Specific volume, V (Equation 2.2):