  We find a thermodynamic description of gas-liquid criticality that is
different from van der Waals and mean-field theories. At the critical
temperature there is no critical point; a liquid phase coexists with a vapor
phase with densities determined by an intersection of 2nd-order percolation
transition loci. There is a line of critical states of constant chemical
potential at temperatures above which there exists a supercritical mesophase,
and below which there is the familiar two-phase liquid-vapor coexistence
region.
