Answer:
Steam distillation is actually distillation under reduced pressure.
In steam distillation, the mixture boils when sum of vapour pressure of water
and organic liquid becomes equal to the atmospheric pressure \[(P={{P}_{1}}+{{P}_{2}})\].
Since, the vapour pressure of water is appreciably higher than that of organic
liquid. Therefore, the organic liquid vaporises at a temperature much lower
than its normal boiling point.
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