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Longman Dictionary of Contemporary English
liquefaction
noun
EXAMPLES FROM CORPUS
▪ That in turn requires extraction and electrolysis of 450 tons of water and liquefaction of the resulting 50 tons of hydrogen.
▪ The country's political isolation and lack of indigenous oil has made coal liquefaction a major technology.
▪ This corresponds to the liquefaction of the gas at this temperature.
The Collaborative International Dictionary
Liquefaction

Liquefaction \Liq`ue*fac"tion\ (l[i^]k`w[-e]*f[a^]k"sh[u^]n), n.

  1. The act or operation of making or becoming liquid; especially, the conversion of a solid into a liquid by the sole agency of heat.

  2. The state of being liquid.

  3. (Chem. Physics) The act, process, or method, of reducing a gas or vapor to a liquid by means of cold or pressure; as, the liquefaction of oxygen or hydrogen.

Douglas Harper's Etymology Dictionary
liquefaction

late 15c., from French liquéfaction, from Late Latin liquefactionem (nominative liquefactio), noun of action from past participle stem of liquefacere "to make liquid, melt" (see liquefy).

Wiktionary
liquefaction

n. Process of, or state of having been, made liquid.

WordNet
liquefaction

n. the conversion of a solid or a gas into a liquid

Wikipedia
Liquefaction

Liquefaction is a term used in materials sciences to refer to any process which either generates a liquid from a solid or a gas, or generates a non-liquid phase which behaves in accordance with fluid dynamics. Liquefaction occurs both as part of natural processes, and in man-made processes used in science and commerce. For example, "[a] major commercial application of liquefaction is the liquefaction of air to allow separation of the constituents, such as oxygen, nitrogen, and the noble gases", while another application is the conversion of solid coal into a liquid form usable as a substitute for liquid fuels.

Usage examples of "liquefaction".

CLOTHES Whenas in silks my Julia goes, Till, then, methinks, how sweetly flows That liquefaction of her clothes!

The attachment of the roothairs is effected by the liquefaction of the outer surface of the cellulose walls, and by the subsequent setting hard of the liquefied matter.

There's not so much of that internal liquefaction that made those first cuttings so difficult.

And if any have been so happy as truly to understand Christian annihilation, extasis, exolution, liquefaction, transformation, the kisse of the Spouse, gustation of God, and ingression into the divine shadow, they have already had an handsome anticipation of heaven.

Finally, the diagnosis: a glioma -- a tumor the size of a golf ball on one of his frontal lobes -- malignant, growing, an d encroaching so thoroughly on vascular tissue that surgical removal was impossible, even by liquefaction or laser.