Vac´u`um   Pronunciation: văk´ũ`ŭm
n.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
a - (Phys.) a glass tube provided with platinum electrodes and exhausted, for the passage of the electrical discharge; a Geissler tube.
a - any tube used in electronic devices, containing a vacuum and used to control the flow of electrons in a circuit, as a vacuum diode, triode, tetrode, or pentode.
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.
Noun1.vacuum - the absence of matter
Synonyms: vacuity
2.vacuum - an empty area or space; "the huge desert voids"; "the emptiness of outer space"; "without their support he'll be ruling in a vacuum"
Synonyms: vacancy, void, emptiness
3.vacuum - a region empty of matter
Synonyms: vacuity
4.vacuum - an electrical home appliance that cleans by suction
Synonyms: vacuum cleaner
Verb1.vacuum - clean with a vacuum cleaner; "vacuum the carpets"
Synonyms: hoover, vacuum-clean
To see a vacuum in your dream, suggests feelings of emptiness. You may be experiencing a void in your life. Alternatively, you may need to clean up your act and your attitude. To dream that you are vacuuming, signifies a loss of control.absence, absence of mind, blank, blankness, broom, brush, brush off, clean slate, deprivation, empty space, empty-headedness, hollowness, inanity, jejunity, mental void, negation, negativeness, negativity, nihility, nonbeing, nonentity, nonexistence, nonoccurrence, nonreality, nonsubsistence, not-being, nothing, nothingness, nullity, sweep, sweep out, sweep up, tabula rasa, unactuality, unreality, vacancy, vacuity, vacuousness, vacuum-clean, vapidity, whisk
Translate Vacuum to Spanish, Translate Vacuum to German, Translate Vacuum to French
-- Vacuum --
vacuum aspiration
vacuum bag
vacuum bomb
vacuum bottle
Vacuum brake
vacuum chamber
Vacuum cleaner
vacuum flask
vacuum gage
vacuum gauge
Vacuum pan
vacuum pump
vacuum tube
Vacuum valve
Definitions Index: # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

About this site and copyright information - Online Dictionary Home - Privacy Policy