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+// Exa 3.18

+clc;

+clear;

+close;

+// Given data

+C_P = 1.005;// in kJ/kg-K

+C_V = 0.718;// in kJ/kg-K

+R = C_P - C_V;// in kJ/kg-K

+R= R*10^3;//in J/kg-K

+P1 = 3*10^5;//in N/m^2

+V1 = 1.5;// m^3

+T1 = 15;// in degree C

+T1 = T1  +273;// in K

+m1 = (P1*V1)/(R* T1);// in kg

+m2 = m1+2;//final mass of air in kg

+P2 = P1 * (m2/m1);// in kN/m^2

+T1 = T1 - 273;// in degree C

+T2 = 0;// in degree C

+m = 1;// in kg

+del_U = m * C_P * (T1-T2);// kJ

+disp(del_U,"Total enthapy of air in kJ is");