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Question: 1
Liquid
boils at that temperature when its vapour pressure becomes equal to the
external Pressure. Why?
Answer: 1
1-21Increase in temperature increases the vapour pressure
of liquids. When the vapour pressure of the liquid becomes equal to the external pressure, then the
vapour pressure inside the bubbles of the liquid is such that it can face the external pressure, so the bubbles
burst in the outward direction on the surface. This bursting of the bubbles outwardly is called boiling.