Below this
 point, the Van der Waals equation gives a region where pressure increases as volume increases; that
 problem is fixed with the Maxwell isotherm.
State functions like pressure, volume, and temperature are often normalized to a "reduced" form based
 on their values at this point, which can calculated using the Joback and Lydersen methods. Below this
 point, the Van der Waals equation gives a region where pressure increases as volume increases; that
 problem is fixed with the Maxwell isotherm. According to the Guldberg rule, a liquid's boiling point is
 about two thirds its temperature at this point. Above this point, carbon dioxide is often used as a green
 alternative method to remove caffeine from coffee. This point is also characterized by a nearly vertical line
 on a phase diagram. For 10 points, name this point seen on a phase diagram at which a liquid and gas cease
 to be separate phases.
State functions like pressure, volume, and temperature are often normalized to a "reduced" form based
 on their values at this point, which can calculated using the Joback and Lydersen methods.
{critical} point [or {critical} temperature]