Temperature of evaporation

Q: evaporation 係咪要成 100度 ?
Water moelcules in liquid state has a range of kinetic energy (KE). Some molecules have particularly high KE, some have lower KE. It is the average KE that is indicative of the temperature of liquid water.
At emperatures below boiling point, there are always some molecules that have KE strong enough for them to escape from the intermolecular attraction to escape into the air, forming water vapour. This is evaporation. Evaporation is different from boiling is that during boiling, almost all molecules acquire sufficient energy to escape into the air.
Q: gas state of water 唔係成 100 度咩 ?禁我地咪熱死曬....
Once the high energy water molecules escapes into the air, they lose their energy rapidly by collisions with air molecules. Since temperature is a measure of the KE of water molecules, the decrease of KE of water molecules in air thus lower the temperature of water vapour until both air molecules and water (vapour) molecules are of the same temperature.
Since the number of air molecules in air is usually much much larger than the number of water (vapour) molecules, the energy that comes from the decrease of KE of water (vapour) molecules is shared out by the large number of air molecules. Therefore, the rise in air temperature would not be observable.

煲水滾是要熱到100度C的. 但水在不同度揮發, 看大氣濕度而定的. 當最外水分子吸到能量時, 就不斷地振動, 擺脫了令外水分子吸著, 由液体而蒸發, 變為水氣升離水面. 而度越高揮發越快.