Describe an experiment to show that a liquid boils only when its saturated vapor pressure is equal to external pressure (05marks)

Experiment to show that a liquid boils off when its saturated vapour pressure equals the external pressure

• Air is trapped in the closed limb of the tube by water column.
• The tube is heated in water bath.
• When the water bath begins to boil, the water in the tube comes to the same level in each limb.
• This shows that the vapor pressure in closed limb is equal to external pressure.

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