What is the meaning of Critical_point?
The temperature and pressure at which the vapour density of the gas and liquid phases of a fluid are equal, at which point there is no difference between gas and liquid.
A point at which the derivative of a function is zero or undefined, such as a minimum, a maximum, a point of inflection or, in multivariate calculus, a saddle point.
A juncture at which time a critical decision must be made.
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