Flexi Says: As water is heated, the average kinetic energy of its particles increases. The rate of evaporation increases as more and more molecules are able to escape the liquid’s surface into the vapor phase. Eventually, a point is reached when the molecules all throughout the water have enough kinetic energy to vaporize. At this point, the water begins to boil. Once the boiling point of water is reached any excess heat energy supplied is used to change the state of water from liquid to vapor increasing the potential energy of its molecules.
