|Problem # p045|
For ideal gases the specific heat at constant volume, cv, is a function of temperature only. Experimental data for cv are often approximated by a 3rd order polynomial :
cv = a + b*T + c*T² + d*T³ T = temperature in [K]
Derive the equation for the change of internal energy [kJ/kg] for the ideal gas between two temperatures T1 and T2. Start with the definition of cv.