The solute is the substance dissolved in water.
A hypotonic solution is a solution with a low concentration of solute.
A hypertonic solution is a solution with a high concentration of solute.
An isotonic solution is a solution that contains equal concentrations of solutes.
The direction of water displacement (or osmosis) depends on the total concentration of solute on each side of the membrane and not the nature of the solute.
I don’t quite understand what your asking but if your asking if it’s a mystery then no it isn’t but if this was not the answer you were looking for I suggest you put it another way that makes more sense
Air also affects evaporation,If a air pressure is high on the surface of a body of water,then the water will not evaporate easily.The pressure pushing down on the water makes its difficult for water to escape into the atmosphere as vapor... Temperature,of course,affects how quickly evaporation happens.
Uneven heating of the Earth