Pure water evaporates quickly!
The reasons are as follows
First of all, vapor pressure refers to the presence of vapor of the substance on the surface of a liquid (or a solid) and the pressure generated by them. vapors on the surface of the liquid are the liquid pressure or vapor pressure. The higher the vapor pressure, the faster it evaporates.
According to Raoult's law: the vapor pressure of a solvent in dilute solution is equal to the vapor pressure of a pure solvent multiplied by the mole fraction of the solvent in the solution. In other words, Pa=Pa'*Xa, (Pa' is the saturated vapor pressure of substance a, Xa is the mole fraction of a)
The saturated vapor pressure of water under a certain temperature and pressure is a constant value. Pure water Xa=100%; salt water Xa<100% It is obvious that the vapor pressure of salt water is lower than that of pure water. Pure water evaporatesso faster than salt water!