Question
Wet clothes usually dry more quickly on a warm day than on a cold day. Why?
Solution
The rate of evaporation depends on the difference between saturated vapour pressure (S.V.P.) and actual vapour pressure(V.P.) at a given temperature.
More is the difference in the vapour pressure, greater is the rate of evaporation.
On a hot day, relative humidity is lower than on a cold day and hence the difference of S.V.P. and V.P is more on a hot day as compared to on a cold day. Therefore, the rate of evaporation on a hot day is greater than that on a cold day. Also, when it is hot, the process of evaporation fastens up.
Therefore, wet clothes dry more quickly on a warm day than on a cold day.
More is the difference in the vapour pressure, greater is the rate of evaporation.
On a hot day, relative humidity is lower than on a cold day and hence the difference of S.V.P. and V.P is more on a hot day as compared to on a cold day. Therefore, the rate of evaporation on a hot day is greater than that on a cold day. Also, when it is hot, the process of evaporation fastens up.
Therefore, wet clothes dry more quickly on a warm day than on a cold day.
