The process of steam distillation uses heated steam to extract essential oils from their plant parts. This method is the most commonly used process for producing clean, pure and natural essential oils. Steam distillation begins with boiling water making steam that passes through the plant material. As the steam passes through the plant part, the heat makes the essential oil released. The steam keeps rising into a cooler tube while carrying the aromatic compounds released from the plant. Here, the steam cools and is condensed back into water. The layer of essential oil rises on the top of the water, where it is separated from the water and collected in a Florentine.