Which of the following statements is true for a reversible adiabatic expansion of an ideal gas?
In a reversible adiabatic process (q = 0), Δ U = w. For an ideal gas, Δ U = nCvΔ T, and since expansion cools the gas, Δ T < 0, making Δ U < 0.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Thermodynamic Terms - System Surroundings and Types of Systems
