I am confused why the heat capacity at constant pressure can be different from the heat capacity at constant volume. I am also having difficulties absorbing the material regarding the kinetic theory of gases, such as keeping all the ΔE_int changes with what processes etc. Why can adiabatic processes be treated as isovolumetric when going from one isotherm to another?? How is work calculated? I know I just brought up a lot of different concepts here, but I am very lost when reading about it in my book.