Evaporation is the process by which a liquid is converted into its gaseous form below its boiling point. It occurs through the diffusion of the liquid's vapor through air. The rate of evaporation is affected by temperature, humidity, surface area, and wind speed. Higher temperatures, lower humidity, larger surface areas, and stronger winds all increase the evaporation rate. Evaporation causes cooling by absorbing heat from the surrounding environment during the phase change from liquid to gas.