Chemistry

4: Vapour Pressure

वाष्प दाब

In Class 12 Chemistry, this topic from Chapter 01: Solutions explains vapour pressure as the pressure exerted by a vapour in equilibrium with its liquid at a given temperature. Students learn how temperature, volatility and intermolecular forces affect vapour pressure, and how adding a non-volatile solute lowers the vapour pressure of a solution. The topic also introduces the basis of Raoult’s law and helps students interpret vapour–liquid equilibrium in ideal solutions.