Evaporation

Evaporation relies on the property of different boiling points to separate substances. Water for example, boils at 100 degrees Celsius. Salt, however, boils at 1,413 degrees C. Heating saltwater to 100 degrees C means the water will change into steam, while the salt remains in the dish. The salt can then be collected. The steam is lost into the environment. Evaporation from salty oceans is the way clouds form and deliver freshwater to the land when it rains. This is one of the most important processes enabling life on this planet.