Under which condition is the rate of evaporation highest?

Correct answer: High temperature and dry wind

Answer: B, high temperature and dry wind. Evaporation is the change of liquid water into water vapour from a surface. Higher temperature gives water molecules more energy, so more molecules can escape from the liquid surface. Dry air has relatively little water vapour, so it can accept additional vapour more easily. Wind removes moist air from just above the surface and replaces it with drier air, maintaining a strong vapour gradient and increasing evaporation. B combines the two favourable conditions listed in the options. A is wrong because low temperature provides less energy and calm air allows moist air to remain above the surface. C is wrong because high humidity reduces the capacity of air to accept more vapour; clouds may also limit heating. D is wrong because cold, saturated air has little capacity for additional water vapour. Other factors such as exposed surface area and pressure can also matter, but they are not needed here. Memory cue: evaporation is fastest with heat, dryness and moving air.