At what sort of pressure does an isobaric process occur ?
For a reversible process , the first law of thermodynamics gives the change in the system 's internal energy:formula_3Replacing work with a change in volume givesformula_4Since the process is isochoric , formula_5 , the previous equation now givesformula_6Using the definition of specific heat capacity at constant volume , formula_7 , formula_8Integrating both sides yieldsformula_9Where formula_10 is the specific heat capacity at constant volume , formula_11 is initial temperature and formula_12 is final temperature .