Question

Evaporation is ________. sometimes a cooling process always a cooling process always a warming process sometimes a warming process two of the above are correct.

Answer 1

Evaporation is always a cooling process, as it involves the removal of higher energy molecules from the liquid, which in turn lowers the temperature of the remaining liquid.

Step-by-step explanation:

Evaporation is always a cooling process. This occurs because, during evaporation, liquid molecules with higher kinetic energy escape into the gas phase, thereby lowering the average kinetic energy of the remaining liquid molecules, which results in a decrease in temperature. An everyday example of evaporative cooling can be observed when water on the skin evaporates, leaving the skin feeling cooler. On the other hand, condensation, which is the reverse of evaporation, is a warming process as it releases heat equal to the heat of vaporization.

Answer 2

Evaporation is always a cooling process. For evaporation to occur, energy is needed by the liquid molecules that are changing phase into gas. This energy is taken from the surroundings in the form of heat energy. So when evaporation occurs, the temperature of the surroundings will decrease, making evaporation a cooling process.