What is the most common technique for obtaining essential oils?

• A. distillation
• B. cold pressing
• C. solvent extraction
• D. fermentation

Answer: (A)

Distillation, especially steam distillation, is the most common way to obtain essential oils because many essential oil components are volatile and can be carried away by steam without being destroyed. The steam passes through the plant material, dissolves the oils, and then the vapor is cooled to separate the oil from the water. This method is versatile for a wide range of plants, scalable for industrial production, and avoids introducing solvents. Cold pressing works well for citrus peels but isn’t universal. Solvent extraction can yield high amounts of oil for delicate fragrances but risks solvent residues and is less preferred for pure essential oils. Fermentation isn’t a standard extraction method for essential oils.