at what dew point does condensation occur
In the atmosphere, condensation may appear as clouds, fog, mist, dew or frost, depending upon the physical conditions of the atmosphere. Condensation is not a matter of one particular temperature but of a difference between two. Condensation of water vapour occurs when the temperature of air is lowered to its dew point. All air contains water vapour of varying quantities. The lower the air temperature, the smaller the maximum possible capacity for vapour.