Critical line (thermodynamics)
In thermodynamics, a critical line is the higher-dimensional equivalent of a critical point.[1] It is the locus of contiguous critical points in a phase diagram.These lines cannot occur for a single substance due to the phase rule, but they can be observed in systems with more variables, such as mixtures.Two critical lines may meet and terminate in a tricritical point.This thermodynamics-related article is a stub.