critical point

Science Dictionary
critical point  
  1. Physics The temperature and pressure at which the liquid and gaseous phases of a pure substance become unstable and fluctuate locally within the substance. The critical point of water is at a temperature of 374°C (705.2°F) and a pressure of 218 atmospheres, at which point it becomes opaque. Compare triple point.

  2. Mathematics

    1. A maximum, minimum, or point of inflection of a curve.

    2. A point at which the derivative of a function is zero, infinite, or undefined.


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