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Vacuum vs Underpressure - What's the difference?

vacuum | underpressure |

As nouns the difference between vacuum and underpressure

is that vacuum is a region of space that contains no matter while underpressure is insufficient pressure; a marked drop in pressure.

As a verb vacuum

is to clean (something) with a vacuum cleaner.

vacuum

English

Alternative forms

* (rare)

Noun

(wikipedia vacuum) (en-noun)
  • A region of space that contains no matter.
  • A vacuum cleaner.
  • The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, such as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.
    • a vacuum of 26 inches of mercury, or 13 pounds per square inch

    Usage notes

    * In the sense of "a region of space that contains no matter", the plural of vacuum' is either '''vacua''' or '''vacuums'''. In the sense of a "vacuum cleaner" ' vacuums is the only plural. * The Latin in vacuo'' is sometimes used instead of ''in a vacuum (in free space).

    Synonyms

    * (vacuum cleaner) hoover (British )

    Antonyms

    * (region of space that contains no matter) plenum

    Derived terms

    * power vacuum * vacuum brake * vacuum cleaner * vacuum pan * vacuum valve

    Verb

    (en verb)
  • To clean (something) with a vacuum cleaner.
  • To use a vacuum cleaner.

    • Synonyms

    * (transitive sense) to hoover (British) * (intransitive sense) to do the hoovering, to hoover (British)

    underpressure

    English

    Noun

    (en noun)
  • insufficient pressure; a marked drop in pressure
  • *2007 , Vladimir A. Rakov and Martin A. Uman, Lightning: Physics and Effects , page 378
  • *:The expanding-hot-channel mechanism predicts an initial positive pressure change (an overpressure) while the electrostatic-pressure-relief mechanism predicts an initial negative pressure change (an underpressure ).

    • Antonyms

    * overpressure