Recent content by JayBi

Thank you Vela! My doubt started following the first principle, that links internal energy, not heat directly. Considering the whole system (gas + body + external) seemed the right approach. Thank you

The total variation of internal energy states ##\Delta U_{tot} = 0## ##\Delta U_{tot} = \Delta U_{ext} + \Delta U_{gas} + \Delta U_{obj}## with: ##\Delta U_{ext} = Q_{ext} - W_{ext} = -W_{ext}## ##\Delta U_{gas} = Q_{gas} - W_{gas} = Q_{gas} - ( - W_{ext} ) = Q_{gas} + W_{ext}## ##\Delta U_{obj}...