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+clc
+// Example 1.4.py
+// For thre pressure vessel in Example 1.2, calculate the total internal
+// energy of the gas stored in the vessel.
+
+// Variable declaration from example 1.2
+V = 10             // volume of vessel (m^3)
+p = 20.0           // pressure (atm)
+T = 300            // temperature (Kelvin)
+
+R = 287.0          // gas constant (J/Kg/K)
+gamma1 = 1.4        // ratio of specific heats for air
+
+// Calculations 
+cv = R / (gamma1-1) // specific heat capacity at constant volume(J/Kg K)
+e = cv * T         // internal energy per Kg (J/Kg)
+p = p * 101000.0   // units conversion to N/m^2
+rho = p/R/T        // from ideal gas equation of state (Kg/m^3)
+m = V * rho        // total mass = volume * density (Kg)
+E = m*e            // total energy in J
+
+// Result 
+printf("\n Total internal energy is %.2e J", E)
+