Water evaporates faster without salt. For example, when the sea's salinity increases, the evaporation rate is slower. Salinity refers to the amount of salt in water.
Factors that affect the evaporation of a substance include its surface area, temperature, surface pressure and concentration. The concentration of substances in the air or any other gas, the substance's intermolecular forces and the flow rate of air or any other gas also affect the evaporation rate. A higher concentration of substance means a slower evaporation rate, as in the case of the sea's higher salinity level. The stronger the intermolecular forces in the substance, the slower the evaporation rate. This is because more energy is needed for the molecules to break free and evaporate into the air or any other gas.