## compression

compression, external stress applied to an object or substance, tending to cause a decrease in volume (see pressure). Gases can be compressed easily, solids and liquids to a very small degree if at all. Water, for example, is practically incompressible, thus making it especially useful for hydraulic machines. According to the kinetic-molecular theory of gases, when the molecules of a gas are brought close enough together by compression, the gas (under certain conditions of temperature) undergoes liquefaction. This principle is applied commercially to several gases, including liquid oxygen and the so-called bottled gas (a mixture of hydrocarbons) used as a fuel. Boyle's law deals with the decrease in the volume of a gas in relation to the increase of pressure upon it (see gas laws). The ability or the degree to which an internal-combustion engine reduces the volume of its fuel mixture preparatory to firing is called its compression. Also, a region of high pressure in a fluid is called a compression; thus sound waves are said to propagate at compressions and rarefactions (regions of low pressure) of their medium, such as air.

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"compression." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 29 May. 2017 <http://www.encyclopedia.com>.

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"compression." The Columbia Encyclopedia, 6th ed.. . Retrieved May 29, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/compression

## compress

com·press • v. / kəmˈpres/ [tr.] (often be compressed) flatten by pressure; squeeze; press. ∎  [intr.] be squeezed or pressed together or into a smaller space: the land is sinking as the soil compresses. ∎  squeeze or press (two things) together: Violet compressed her lips together grimly. ∎  express in a shorter form; abridge. ∎  Comput. alter the form of (data) to reduce the amount of storage necessary. ∎  [as adj.] (compressed) chiefly Biol. having a narrow shape as if flattened, esp. sideways: most sea snakes have a compressed tail. • n. / ˈkämˌpres/ a pad of absorbent material pressed onto part of the body to relieve inflammation or stop bleeding: a cold compress. DERIVATIVES: com·press·i·bil·i·ty / kəmˌpresəˈbilitē/ n. com·press·i·ble adj. com·pres·sive / -ˈpresiv/ adj.

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"compress." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 29 May. 2017 <http://www.encyclopedia.com>.

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"compress." The Oxford Pocket Dictionary of Current English. . Retrieved May 29, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/compress-0

## compression

com·pres·sion / kəmˈpreshən/ • n. the action of compressing or being compressed. ∎  the reduction in volume (causing an increase in pressure) of the fuel mixture in an internal combustion engine before ignition. DERIVATIVES: com·pres·sion·al / -shənl/ adj.

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## compression

compression Reduction of the space needed to define an entity using one of the many techniques available. The compression factor is the ratio of the storage size of an uncompressed representation to that of the compressed representation. See also data compression, image compression, speech compression.

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"compression." A Dictionary of Computing. . Encyclopedia.com. 29 May. 2017 <http://www.encyclopedia.com>.

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## compress

compress press together XIV; condense XVIII. — OF. compresser or late L. compressāre, or f. pp. stem compress- of comprimere; see COM-, PRESS.
So compress sb. (surg.) mass of material formed into a pad. XVI. — F. compresse, f. compresser. compression XIV.

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"compress." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 29 May. 2017 <http://www.encyclopedia.com>.

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## compression

compression (kŏm-presh-ŏn) n. the state in which an organ, tissue, or part is subject to pressure. cerebral c. pressure on brain tissue from a cerebral tumour, intracranial haematoma, etc. c. venography see venography.

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"compression." A Dictionary of Nursing. . Encyclopedia.com. 29 May. 2017 <http://www.encyclopedia.com>.

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## compress

compress (kom-press) n. a pad of material soaked in hot or cold water and applied to an injured part of the body to relieve the pain of inflammation.

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## compress

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