Vacuum pump

Vacuum pump
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.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • vacuum pump — vacuum ,pump noun count a pump that creates a VACUUM in an enclosed space …   Usage of the words and phrases in modern English

  • vacuum pump — n. 1. a pump used to draw air or gas out of sealed space 2. PULSOMETER (sense 1) …   English World dictionary

  • Vacuum pump — A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke. Types Pumps can be broadly categorized according to three… …   Wikipedia

  • vacuum pump — UK / US noun [countable] Word forms vacuum pump : singular vacuum pump plural vacuum pumps a pump that creates a vacuum in an enclosed space …   English dictionary

  • vacuum pump — Pulsometer Pul*som e*ter, n. [Pulse + meter.] [1913 Webster] 1. A device, with valves, for raising water by steam, partly by atmospheric pressure, and partly by the direct action of the steam on the water, without the intervention of a piston;… …   The Collaborative International Dictionary of English

  • vacuum pump — vakuuminis siurblys statusas T sritis automatika atitikmenys: angl. vacuum pump vok. Vakuumpumpe, f rus. вакуумный насос, m pranc. pompe à vide, f; pompe d aspiration, f …   Automatikos terminų žodynas

  • vacuum pump — vakuuminis siurblys statusas T sritis Standartizacija ir metrologija apibrėžtis Įrenginys dujų ir garų slėgiui uždaroje ertmėje sumažinti. atitikmenys: angl. vacuum pump vok. Vakuumpumpe, f rus. вакуум насос, m pranc. pompe à vide, f …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • vacuum pump — vakuuminis siurblys statusas T sritis chemija apibrėžtis Įrenginys dujų ir garų slėgiui uždaroje ertmėje sumažinti. atitikmenys: angl. vacuum pump rus. вакуум насос …   Chemijos terminų aiškinamasis žodynas

  • vacuum pump — vakuuminis siurblys statusas T sritis fizika atitikmenys: angl. vacuum pump vok. Vakuumpumpe, f rus. вакуумный насос, m pranc. pompe à vide, f …   Fizikos terminų žodynas

  • vacuum pump — vakuuminis siurblys statusas T sritis Energetika apibrėžtis Įrenginys vakuumui sukurti, padidinti ir palaikyti. Veikimo principas panašus kaip čiurkšlinio siurblio. Ypač giliam vakuumui sukurti naudojamas difuzinis siurblys. atitikmenys: angl.… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”