critical point definition of critical point in the Free Online Encyclopedia.

critical point

In science, the set of conditions under which a liquid and its vapour become identical. The conditions are the critical temperature, the critical pressure, and the critical density. If a closed vessel is filled with a pure substance, partly liquid and partly vapour, and the average density equals the critical density, the critical conditions can be achieved. As the temperature is raised, the vapour pressure increases, and the gas phase becomes denser while the liquid expands and becomes less dense. At the critical point, the densities of liquid and vapour become equal, eliminating the boundary between the two.

critical point

′krid·ə·kəl ′pȯint

(mathematics)

A point at which the first derivative of a function is either 0 or does not exist.

(petroleum engineering)

A location on the drilling line which is subject to strain when the pipe is run into or pulled out of the drill hole.

(physical chemistry)

The temperature and pressure at which two phases of a substance in equilibrium with each other become identical, forming one phase.

The temperature and pressure at which two ordinarily partially miscible liquids are consolute.

Bear in mind, too, that under these untoward circumstances he has to cut many feet deep in the flesh; and in that subterraneous manner, without so much as getting one single peep into the ever-contracting gash thus made, he must skilfully steer clear of all adjacent, interdicted parts, and exactly divide the spine at a critical point hard by its insertion into the skull.

Moby Dick LXVIII-CXXXIV by Melville, Herman View in context

In the First Part of this history we left the valiant Biscayan and the renowned Don Quixote with drawn swords uplifted, ready to deliver two such furious slashing blows that if they had fallen full and fair they would at least have split and cleft them asunder from top to toe and laid them open like a pomegranate; and at this so critical point the delightful history came to a stop and stood cut short without any intimation from the author where what was missing was to be found.

Don Quixote by Cervantes, Miguel View in context

He told me that it was a critical point indeed for me to manage, and he did not see which way I should get out of it; but he would consider it, and let me know next time we met, what resolution he was come to about it; and in the meantime desired I would not give my consent to his brother, nor yet give him a flat denial, but that I would hold him in suspense a while.

The Fortunes & Misfortunes of the Famous Moll Flanders by Defoe, Daniel View in context

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