Vaporization of a liquid or sublimation of a solid may occur over a wide range of temperature and pressure. Wet clothes will dry, and a pan of water will slowly evaporate to dryness. Below the freezing point, frozen clothes will dry and a pan of ice cubes will slowly evaporate without first melting. Under virtually all conditions, some of the molecules near the surface of a liquid or solid attain enough energy to pull away from the attraction of their neighbors and escape into the gas or vapor phase. Similarly, molecules in the gas phase occasionally strike the surface and are captured by the attraction of molecules in the liquid or solid phase. When the liquid or solid is not confined, most gas phase molecules will move away from the liquid or solid, and few will reunite with the liquid or solid phase. In this case...