What energy change occurs as air undergoes adiabatic cooling during cloud formation?

• A. Increase in kinetic energy
• B. No energy change
• C. Decrease in kinetic energy
• D. Increase in potential energy

Answer: (C)

During adiabatic cooling, air rises and expands as it cools without exchanging heat with its environment. As this process occurs, the molecules in the air lose kinetic energy, which is why the correct choice is a decrease in kinetic energy. When the temperature of the air drops, the movement of the air molecules becomes less vigorous, leading to a reduction in their average kinetic energy.

This cooling often results in condensation, as the cooler air can hold less moisture. The process of condensation releases latent heat, but the key aspect of adiabatic cooling focuses on the initial cooling and expansion of rising air, where the primary change is a decrease in kinetic energy. This contrasts with the other options, which do not accurately reflect the energy dynamics during adiabatic cooling.