Question

what is the difference between distillation, distillation under reduced pressure and steam distillation?​

Answer 1

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The distillation under reduced pressure or vacuum distillation is used for those compounds which decomposes at a temperature below their normal boiling points; such compounds cannot be purified by simple distillation. ... Steam distillation is based on Dalton's law of partial pressures.

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In other words, distillation is used to separate volatile liquids from non-volatile impurities or a mixture of those liquids that have sufficient difference in boiling points. ... Under the conditions of reduced pressure, the liquid will boil at a low temperature than its boiling point and will, therefore, not decompose.