The pressure that liquid surface particles experience when they are in contact with air is known as vapor pressure.
They consequently apply pressure on the surface, which is merely the vapor pressure. However, in a solution, the non-volatile solute takes up residence in the surface solvent particles.
Any solution's vapor pressure will fall as concentration increases because doing so simply increases the amount of solute particles on the surface. Therefore, when the number of solute particles increases, the solute particles occupy the majority of them.
Therefore, the vapor pressure will be high for a pure solvent and will fall for a solution when a non-volatile solution is introduced.
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