The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapor in the vapor phase. A suitable method for the extraction of these oils from the flowers is
| 1. | Distillation | 2. | Crystallisation |
| 3. | Distillation under pressure | 4. | Steam distillation |
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