| Distillation | Distillation under reduced pressure | Steam distillation |
|---|---|---|
| $i$. Used to separate two liquids having a sufficient difference (more than $30^{\circ}C$) in their boiling points and to purify impure liquids. | $i$. Used to purify liquids having very high boiling points that decompose at or below their boiling points by lowering the pressure. | $i$. Applied to substances that are steam volatile and immiscible with water. |
| $ii$. Purified liquid is obtained directly. | $ii$. Pure liquid is obtained after the process. | $ii$. $A$ mixture of water and the liquid is obtained,which is then separated using a separatory funnel. |
| $iii$. Pressure in the flask does not need to be decreased. | $iii$. Pressure in the flask must be decreased. | $iii$. Steam is passed through the mixture. |
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