In the (*) van der Waals model, the pressure at this point is a over 27 b squared.
The behavior of systems at these states can be modeled by a set of exponents derived from field theory, which describe the power law behaviors of physical quantities as functions of ‘reduced' properties of the system. For fluids, this state occurs when both the first and second partial derivatives of pressure with respect to volume are zero. In the (*) van der Waals model, the pressure at this point is a over 27 b squared. The enthalpy of vaporization approaches zero at this point. This point marks the end of the gas-liquid coexistence line. For 10 points, name this point on a phase diagram above which vapor and liquid phases are no longer distinguishable.
The behavior of systems at these states can be modeled by a set of exponents derived from field theory, which describe the power law behaviors of physical quantities as functions of ‘reduced' properties of the system.
critical point (accept critical temperature or critical pressure, prompt on phase transition grudgingly)