evaporation
Evaporation is the process of vaporizing the surface of the liquid. Unlike the other vaporization process, "evaporation" is that evaporation takes place only on the surface of the liquid and can occur at any temperature. In industrial production, the general need to heat, can be below the boiling point of evaporation, boiling point can also be boiling evaporation. Different liquids have different boiling points, and some liquids are oxidized or decomposed at boiling or below boiling point, requiring evaporation under reduced pressure (vacuum evaporation). The occurrence of evaporation is due to the occurrence of different degrees of collision with each other when the liquid particles flow, the collision of particles near the surface of the liquid has enough energy to escape from the liquid, made of evaporation. Evaporation is an important way of water circulation, the sun's energy to the ocean, the lake of water, the water vapor in the soil evaporate, the formation of clouds. In hydrology, evaporation and transpiration (evaporation of water in plant leaf pores) are collectively evapotranspiration. In the evaporation, the liquid surface will have several average free-range vapor film, known as the Knoxon layer. ...