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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)
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