About The Word Vacuum
Learn about the word Vacuum to help solve your crossword puzzle. Discover Vacuum definitions and meaning, origins, synonyms, related terms and more at the free Crossword Dictionary.
Vacuum
Vacuum Definition And Meaning |
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What's The Definition Of Vacuum?
[n] an electrical home appliance that cleans by suction
[n] a region empty of matter [n] the absence of matter [v] clean with a vacuum cleaner Synonyms | Synonyms for Vacuum: hoover | vacuity | vacuity | vacuum cleaner | vacuum-clean Related Terms | Find terms related to Vacuum: See Also | clean | dust bag | emptiness | home appliance | Hoover | household appliance | make clean | part | region | vacuum bag Vacuum In Webster's Dictionary \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.
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.
{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}.
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