What is vapour pressure of a liquid ?

What is a vapour pressure of liquid ? What is relative lowering of vapour pressure ?

What is vapour pressure of liquids? How the vapour pressure of a liquid is related to its boiling point?

What do you mean by vapour pressure of a liquid ? Describe the vapourization and condensation processes in a closed vessel. How does the vapour pressure change with temperature ?

What is the effect of temperature on vapour pressure of a liquid ?