Vacuum

Vacuum
Vacuum Vac"u*um, n.; pl. E. {Vacuums}, L. {Vacua}. [L., fr. vacuus empty. See {Vacuous}.] 1. (Physics) A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum. [1913 Webster]

2. The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch. [1913 Webster]

{Vacuum brake}, a kind of continuous brake operated by exhausting the air from some appliance under each car, and so causing the pressure of the atmosphere to apply the brakes.

{Vacuum pan} (Technol.), a kind of large closed metallic retort used in sugar making for boiling down sirup. It is so connected with an exhausting apparatus that a partial vacuum is formed within. This allows the evaporation and concentration to take place at a lower atmospheric pressure and hence also at a lower temperature, which largely obviates the danger of burning the sugar, and shortens the process.

{Vacuum pump}. Same as {Pulsometer}, 1.

{Vacuum tube} (Phys.), a glass tube provided with platinum electrodes and exhausted, for the passage of the electrical discharge; a Geissler tube.

{Vacuum valve}, a safety valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, in order to prevent collapse.

{Torricellian vacuum}. See under {Torricellian}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Vacuum — Основная информация Жанр синти поп Электропоп …   Википедия

  • vacuum — [ vakɥɔm ] n. m. • 1872; mot lat. ♦ Sc. Espace vide, sans matière. ⇒ vide. ⊗ HOM. Vacuome. vacuum n. m. Didac. Espace vide, sans matière. ⇒VACUUM, subst. masc. PHYS. Espace vide, milieu vide. Synon. vide. Entre l atome et l observation il y a une …   Encyclopédie Universelle

  • vacuum — VÁCUUM, vacuumuri, s.n. 1. (fiz.) Vid. 2. Aparat în care se concentrează o soluţie, prin fierbere în vid, la temperaturi joase. [pr.: cu um] – Din lat., fr. vacuum. Trimis de bogdanrsb, 13.09.2007. Sursa: DEX 98  VÁCUUM s. v. vid. Trimis …   Dicționar Român

  • vacuum — [vak′yo͞om, vak′yo͞o əm] n. pl. vacuums or vacua [vak′yo͞o ə] [L, neut. sing. of vacuus, empty] 1. a space with nothing at all in it; completely empty space 2. a) an enclosed space, as that inside a vacuum tube, out of which most of the air or… …   English World dictionary

  • vacuum — ► NOUN (pl. vacuums or vacua) 1) a space entirely devoid of matter. 2) a space from which the air has been completely or partly removed. 3) a gap left by the loss or departure of someone or something important. 4) (pl. vacuums) informal a vacuum… …   English terms dictionary

  • vacuum — cleaner Vac u*um clean er A machine for cleaning carpets, tapestry, upholstered work, etc., by suction; sometimes called a {vacuum}. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

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  • vacuum — index blank (emptiness), need (deprivation) Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

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