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+clc;clear;
+//Example 3.11
+
+//given values
+P=1;
+T=50+273;//converting into Kelvin
+vgiv=0.021796;//specific vol. given
+
+//from Table A-1
+R=0.0815;
+Pcr=4.059;
+Tcr=374.2;
+
+//calculation
+
+//Part A
+v1=R*T/(P*1000);
+disp(v1,'specific volume of refrigerant-134a under the ideal-gas assumption in m^3/kg');
+e=(v1-vgiv)/vgiv;
+disp(e,'an error of');
+
+//Part B
+//determine Z from the compressibility chart, we will calculate the reduced pressure and temperature
+Pr=P/Pcr;
+Tr=T/Tcr;
+//from chart
+Z=0.84;
+v=Z*v1;
+disp(v,'specific volume of refrigerant-134a under the generalized compressibility chart in m^3/kg');
+e=(v-vgiv)/vgiv;
+disp(e,'an error of');