A high pressure jump near it indicated that the transition from high field phase to paramagnetic phase is first order for Hel
A high pressure jump near it indicated that the transition from high field phase to paramagnetic phase is first order for Helium.  The ITS-90 temperature scale uses a portion of this value for Neon, Oxygen, and other materials as definitions for some of their temperature points. For water it occurs about .01 degrees Celsius above the normal freezing point.  For most substances the liquid phase can only occur at higher temperatures, and in all substances it can only occur at higher pressures. FTP, name this spot on a phase diagram where solid, liquid, and gas can exist in equilibrium.
A high pressure jump near it indicated that the transition from high field phase to paramagnetic phase is first order for Helium.  
{Triple} Point