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2. Vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Vacuum_cleaner

   The vacuum head may be unpowered, or have beaters operated by an electric motor or by an air-driven turbine. The dirt bag or collection bin in a central vacuum system is usually so large that emptying or changing needs to be done less often, perhaps a few times per year for an ordinary household.

3. Field electron emission - Wikipedia

   en.wikipedia.org/wiki/Field_electron_emission

   Large-area field emission sources have been of interest since the 1970s. In these devices, a high density of individual field emission sites is created on a substrate (originally silicon). This research area became known, first as "vacuum microelectronics", now as "vacuum nanoelectronics".

4. Vacuum - Wikipedia

   en.wikipedia.org/wiki/Vacuum

   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. A vacuum (pl.: vacuums or vacua) is space devoid of matter. The word is derived from the Latin adjective vacuus (neuter vacuum) meaning "vacant ...

5. This bestselling 'lightweight but sturdy' Shark vacuum is ...

   www.aol.com/lifestyle/this-bestselling...

   Walmart's amazing sale on the Shark Navigator has the vacuum marked down to just $97, which means it's over half off its usual price — we haven't seen this fan-favorite cleaner this low in ...

6. These are the best Labor Day vacuum deals from Dyson ... - AOL

   www.aol.com/lifestyle/these-are-the-best-labor...

   A cordless vacuum is a great option if you live in a small space like an apartment or want a vacuum for quick daily use. It can reach tall areas with ease, as it tends to be more lightweight than ...

7. List of vacuum cleaners - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_cleaners

   This is a list of vacuum cleaners and robot vacuum cleaner manufacturers. A vacuum cleaner is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from floors, and optionally from other surfaces as well. The dirt is gathered by either a dustbag or a rigid cartridge, which may be emptied and reused.