Evaporation - Elementary Science

EVAPORATION Evaporation is a process by which water gets converted from a liquid form to vapor form. Evaporation of oceans accounts to 80% of water delivered as precipitation with balance occurring on land, inland waters and plants surfaces. Experiment: Place a beaker of water on a stove. Let the water boil. If you continue to heat the water it turns into steam and evaporates. Add some spoons of salt into water. Stir the water well, the salt gets dissolved. On heating the salt solution, the water gets evaporated leaving the salt behind. Common salt is one among them. When sea water is allowed to stand in shallow pits, water gets heated by the sunlight and slowly turns into water vapor by evaporation. In a few days water evaporates leaving the water behind leaving the salts completely. Common salt is then obtained from this mixture by further purification.