乜水分子蒸發時,佢既本身平均動能唔會改變咩??

會...

06 marking有一段：
when the molecules of some liquid with greater kinetic energy leave the liquid by evaparation, the average kinetic energy of the liquid decreases. Thus, the temperature of the liquid decreases.

average kinetic energy depends on temperature only. At higher temperature, the molecules move faster. But water boils at constant temperature, so there is no change in average kinetic energy of water.

水 在蒸發過程中一直和環境保持熱平衡,即所需汽化熱由環境供給,保持溫度與環境一樣而不變.溫度不變即平均動能不變.

唔會......(溫度冇變)
變既係平均位能(形態改變)