definitions
• synonyms

# critical point

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noun
1. Physics. the point at which a substance in one phase, as the liquid, has the same density, pressure, and temperature as in another phase, as the gaseous.
2. Mathematics.
1. (of a function of a single variable) a point at which the derivative of the function is zero.
2. (of a function of several variables) a point at which all partial derivatives of the function are zero.

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First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for critical point

# critical point

noun
1. physics
1. the point on a phase diagram that represents the critical state of a substance
2. another name for critical state
2. maths the US name for stationary point
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

critical point in Science

# 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.