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+// Example 7_2
+clc;funcprot(0);
+// Given data
+P_1=15;// The pressure at inlet in psia
+P_2=75;// The pressure at exhaust in psia
+T_1=80;// The temperature at inlet in °F
+T_2=440;// The temperature at exhaust in °F
+T_0=537;// °F
+R=53.3/778;// Btu/lbmol.°R
+
+// Calculation
+// Using values from air tables
+phi_1=0.60078;// Btu/lbmol.°R
+phi_2=0.72438;// Btu/lbmol.°R
+ds=(phi_2-phi_1)-((R)*log(P_2/P_1));// The entropy change in Btu/lbm.°R
+i=T_0*ds;// The irreversibility in Btu/lbm
+printf("\nThe irreversibility,i=%1.2f Btu/lbm",i);