Vacuum
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A vacuum is space devoid of matter. The word is derived from the Latin adjective vacuus meaning "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than a
Vacuum pump and bell jar for vacuum experiments, used in science education during the early 20th century, on display in the Schulhistorische Sammlung ('School Historical Museum'), Bremerhaven, Germany
The Crookes tube, used to discover and study cathode rays, was an evolution of the Geissler tube.
A glass McLeod gauge, drained of mercury
Light bulbs contain a partial vacuum, usually backfilled with argon, which protects the tungsten filament
Vacuum cleaner
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A vacuum cleaner, also known simply as a vacuum, is a device that uses suction, and often agitation, in order to remove dirt and other debris from carpets, hard floors, and other surfaces.
Vacuum
…vacuum refers to how closely it approaches a perfect vacuum. Other things equal, lower gas pressure means higher-quality vacuum. For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. But higher-quality vacuums are possible. Ultra-high vacuum chambers, common in chemistry…
A Numatic Henry, one of the most common canister-style cleaners in the United Kingdom
An early hand-pumped vacuum cleaner
Housemaid using "dedusting pump", c. 1906
A hand-powered pneumatic vacuum cleaner, c. 1910. An early electric-powered model is also shown.