In my textbook, it is written that lowering of vapour pressure is not a colligative property but relative lowering of vapour pressure is a colligative property. But why is that? There is literally no explanation given in my textbook as to why this is true. Please someone explain. I am so confused. Please help. (By lowering of vapour pressure I mean $P_{0} - P_{S}$ where $P_{0}$ is the vapour pressure of pure solvent and $P_{S}$ is the vapour pressure of the solvent containing non-volative solute. Relative Lowering in Vapour Pressure means $\frac{P_{0} - P_{S}}{P_{0}}$).

  • $\begingroup$ Could you clarify with respect to the difference between 'relative lowering' and 'lowering'? $\endgroup$ – Jon Custer May 6 at 18:27
  • $\begingroup$ Consider reporting the whole sentences $\endgroup$ – Alchimista May 7 at 9:10

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