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+// Implementation of example 3.1
+// Basic and Applied Thermodynamics by P.K.Nag
+// page 54
+
+clc
+clear
+
+P=760 //(mm Hg)
+dv=0.5 //(m^3)
+// since P is in mm Hg and change in volume(dv) is in m^3,so we'll change the unit of pressure
+p=101.325 //(kN/m^2)
+
+Wd=(p*dv);
+disp("work done by system =")
+disp(Wd)
+disp("kJ")
+// in this work is done by the system,so it is positive