Condense the Steam
The plant chamber now begins filling up with steam, the volatile compounds in the plant (essential oils) get all excited by the steam and vaporize as well. The steam exits through a pipe exiting out through the lid of the plant chamber, and passes through a series of narrow stainless steel tubes. These tubes are immersed in cooling water. As the steam and vaporized compounds dance around in these narrow tubes, they come in contact with the cool tube walls. By the time they reach the end of the tubes, they are pretty tired and by this point have condensed back into a liquid.
This is the most classical step of steam distillation, and how we are able to harvest the steam (and essential oils).