When water evaporates, the water molecules gain enough energy to overcome the forces holding them together in the liquid state and escape into the air. This process occurs when water is exposed to heat, such as from the sun, or when the air is dry and has a low relative humidity.

As water molecules evaporate, they move faster and become more spread out, resulting in a decrease in the density of the water. This process continues until all the water has evaporated, leaving behind only the dissolved solids, such as salts and minerals.

The rate of evaporation is influenced by several factors, including the temperature of the water, the humidity of the air, the surface area of the water, and the air movement. Higher temperatures, lower humidity, larger surface area, and increased air movement all contribute to a faster evaporation rate.