critical point

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noun

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.

Mathematics.

(of a function of a single variable) a point at which the derivative of the function is zero.

(of a function of several variables) a point at which all partial derivatives of the function are zero.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To critical point

Collins

World English Dictionary

critical point

—n
1.	physics
	a. the point on a phase diagram that represents the critical state of a substance
	b. another name for critical state
2.	maths the US name for stationary point

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10

Critical point is always a great word to know.

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a chattering or flighty, light-headed person.

a scrap or morsel of food left at a meal.

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American Heritage

Science Dictionary

critical point

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.
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.

Example sentences

You'd go up there, relying on a computer, and at a critical point it would

crash.

The problem, say conservationists, is that the oceans have reached a critical

point.

One more thing: there is a big hole-a big question-mark-at a critical point.

When those stresses reach a critical point something has to give.