Source: https://www.youtube.com/watch?v=AzmXVvxXN70&ab_channel=MichelvanBiezenMichelvanBiezen
Hypothesis: Initial internal energy of an isobaric process always 0 because it is a state process
In reviewing thermodynamic processes, it is common to see the change in internal energy and not to separately calculate final and initial internal energy. Is it because of the hypothesis I posted above?
The internal energy does change in an isobaric process, so your hypothesis is incorrect. Your video confirms this.
Only differences between internal energy are of concern, so in the process we evaluate the difference in internal energy, which is not the same as assuming the initial internal energy is zero. An earlier question/response address the absolute value of internal energy: see Can mass-energy equivalence be used to measure absolute internal energy? on this exchange.
