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+clc;
+p1=5; // Initial pressure of argon gas in bar
+T1=30; // Initial temperature of argon gas in degree celcius
+v1=1; // Initial volume of argon gas in m^3 by assumption
+v2=2*v1; // Final volume of argon gas in m^3
+R=8.3144/40; // Characteristic gas constant of argon gas in kJ/kg K
+p2=p1*(v1/v2); // Final pressure of argon gas
+delta_s= R*log (v2/v1); // change in entropy (choosing the reversible isothermal path)
+disp ("kJ/kg K",delta_s,"change in entropy (choosing the reversible isothermal path) = ","bar",p2,"Final pressure of argon gas =");