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3.2.1.5 Phototubes and photomultipliers. 3.2.1.6 Voltage stabilizers. ... This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, ...
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.
Dyson Limited, d.b.a Dyson, is a Singaporean–British multinational technology company. [7] Founded in 1991 by James Dyson in Malmesbury, England, the company designs and manufactures household appliances such as vacuum cleaners, air purifiers, hand dryers, bladeless fans, heaters, hair dryers, and lights.
NIST/CODATA refers to μ 0 as the vacuum magnetic permeability. [10] Prior to the 2019 revision, it was referred to as the magnetic constant. [11] Historically, the constant μ 0 has had different names. In the 1987 IUPAP Red book, for example, this constant was called the permeability of vacuum. [12]
Fracture toughness varies by approximately 4 orders of magnitude across materials. Metals hold the highest values of fracture toughness. Cracks cannot easily propagate in tough materials, making metals highly resistant to cracking under stress and gives their stress–strain curve a large zone of plastic flow.
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 ...