What is relative lowering of vapour pressure ?

What is the relative lowering of vapour pressure ? How is it useful in determining the molecular weight of solute ?

The vapour pressure of a pure liquid is 0.043 bar at a certain temperature. When a nonvolatile solute is dissolved into it, the vapour pressure of the solution is found to be 0.041 bar. What is the relative lowering of vapour pressure?

Show that relative lowering of vapour pressure is a colligative property.

Show that relative lowering of vapour pressure is a colligative property.

What is meant by lowering of vapour pressure? How does the relative lowering of vapour pressure depend on the number of moles of solute in a solution?

The law of relative lowering of vapour pressure was given by