Before revision: In a typical phase diagram, the boundary between gas and liquid runs from the triple point to the critical point.|Supercritical drying (red arrow) goes beyond the critical point of the working fluid in order to avoid the direct liquid–gas transition seen in ordinary drying (green arrow) or the two phase changes in freeze-drying (blue arrow).
After revision: alt=In a typical phase diagram, the boundary between gas and liquid runs from the triple point to the critical point.|Supercritical drying (red arrow) goes beyond the critical point of the working fluid in order to avoid the direct liquid–gas transition seen in ordinary drying (green arrow) or the two phase changes in freeze-drying (blue arrow).