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+//example 3
+//entropy change
+clear
+clc
+C=4.184 // specific heat of water in kJ/kg-K
+T1=20 //initial temperature of water in celsius
+T2=90 //final temperature of water in celsius
+dS1=C*log((T2+273.2)/(T1+273.2)) //change in entropy in kJ/kg-K
+dS2=1.1925-0.2966 //in kJ/kg-K using steam tables
+printf("\n hence,change in entropy assuming constant specific heat is dS1=%.4f kJ/kg-K.\n",dS1)
+printf("\n using steam table is dS2=%.4f kJ/kg-K.\n",dS2) 
+\ No newline at end of file