In order to isolate essential oils by hydrodistillation, the aromatic plant material is packed
in a still and a sufficient quantity of water is added and brought to a boil; alternatively, live steam
is injected into the plant charge. Due to the influence of hot water and steam, the essential oil is
freed from the oil glands in the plant tissue. The vapor mixture of water and oil is condensed by
indirect cooling with water. From the condenser, distillate flows into a separator, where oil
separates automatically from the distillate water.