Boiling, a type of phase transition,'s the rapid vaporization of a liquid, which typically occurs when a liquid's heated to its boiling point, the temperature at which the vapor pressure of the liquid's equal to the pressure exerted on the liquid by the surrounding environmental pressure. Thus, a liquid may also boil when the pressure of the surrounding atmosphere's sufficiently reduced, such as the use of a vacuum pump or at high altitudes. Boiling occurs in three characteristic stages, which a… (More on Boiling)