It’s easy to understand, why the reduction of air temperature leads to a decrease in its relative humidity. The fact is that the process of evaporation in a confined space can be extended as long as the number of water molecules into the air becomes equal to the number of molecules returning from the air into the liquid. At this time the atmosphere becomes saturated with moisture. The temperature stimulates the evaporation process, because at high temperature the molecular kinetic energy is higher than at low temperature. Consequently, at high temperature, more molecules break away from the surface of the liquid, and the vapor pressure in the atmosphere becomes saturated with moisture. In other words, at high temperatures, the atmosphere can “hold” more moisture. Conversely, at low temperatures the atmosphere contains less moisture. Therefore, those who wear Acuvue Oasys Contact Lenses should take care of an additional watering process of the eye with special drops when is cold.