Q29
General SciencePhysics
The internal energy of gas due to adiabatic expansion will be
- a.decreased
- b.increased
- c.same
- d.dissipiated
Answer: (A) decreased
In an adiabatic process no heat enters or leaves, so by the first law $\Delta U = -W$. During expansion the gas does work on its surroundings, so its internal energy falls and it cools. It cannot increase or stay the same, and 'dissipated' is not the right description.