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+clc;clear;
+//Example 7.7
+
+//given data
+P1=1;
+T1=110;
+P2=5;
+T2=120;
+
+//from Table 
+//At P1 and T1
+s1=4.875;
+cp1=3.471;
+//at P2 and T2
+s2=5.145;
+cp2=3.486;
+
+//calculations
+//part - a
+dSa=s2-s1;
+disp(dSa,'change in entropy in kJ/kg K using tabulated properties');
+//part - b
+cavg=(cp1+cp2)/2;
+dSb=cavg*log(T2/T1);
+disp(dSb,'change in entropy in kJ/kg K approximating liquid methane as an incompressible substance');
+E=(dSb-dSa)/dSa*100;
+disp(E,'Error % is')