A vacuum bed is a device sometimes used in BDSM play.. A person is placed in a latex envelope spanned by a frame and a suction pump or floor vacuum removes most of the air in the envelope. The frame can be either a simple rectangle of pierced PVC pipes, joined by PVC joints, or three-dimensional frames of various sizes, with a similar PVC construction.

In standard conditions at atmospheric pressure, air serves as an excellent insulator, requiring the application of a significant voltage of 3.0 kV/mm before breaking down (e.g., lightning, or sparking across plates of a capacitor, or the electrodes of a spark plug).In partial vacuum, this breakdown potential may decrease to an extent that two uninsulated surfaces with different potentials ...

A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal.Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s. Valve amplifiers can be used for applications such as guitar amplifiers, satellite transponders …

減圧蒸留にて精留されたもの。英語のVacuum Gas OilからVGOや原料としてはWVGO（Whole VGO)とも呼ばれる。沸点範囲が350 - 550℃程度の炭化水素からなり、このうち沸点が約450℃以下のものを軽質減圧軽油、約450℃以上のものを重質減圧軽油と言う。

Henry (also known as Henry Hoover) is the brand name given to a canister vacuum cleaner made and sold by Numatic International, and is the only mass-produced consumer vacuum cleaner still made in Britain. It is most notable for its cartoon eyes and mouth on the body of the vacuum cleaner, making a face, with the hose connector or hose as nose.

The early Nixie displays were made by a small vacuum tube manufacturer called Haydu Brothers Laboratories, and introduced in 1955 by Burroughs Corporation, who purchased Haydu.The name Nixie was derived by Burroughs from "NIX I", an abbreviation of "Numeric Indicator eXperimental No. 1", although this may have been a backronym designed to justify the evocation of the …

Raptor is a family of full-flow staged-combustion-cycle rocket engines developed and manufactured by SpaceX for use on the in-development SpaceX Starship.The engine is powered by cryogenic liquid methane and liquid oxygen ("methalox") rather than the RP-1 and liquid oxygen ("kerolox") used in SpaceX's prior Merlin and Kestrel rocket engines. The Raptor …

Degassing, also known as degasification, is the removal of dissolved gases from liquids, especially water or aqueous solutions.There are numerous methods for removing gases from liquids. Gases are removed for various reasons. Chemists remove gases from solvents when the compounds they are working on are possibly air- or oxygen-sensitive (air-free technique), or …

In physics, horror vacui, or plenism (/ ˈ p l iː n ɪ z əm /), commonly stated as "nature abhors a vacuum", is a postulate attributed to Aristotle, who articulated a belief, later criticized by the atomism of Epicurus and Lucretius, that nature contains no vacuums because the denser surrounding material continuum would immediately fill the rarity of an incipient void.

The spherical cow is a humorous metaphor for highly simplified scientific models of complex phenomena. Originating in theoretical physics, the metaphor refers to physicists' tendency to reduce a problem to the simplest form imaginable in order to make calculations more feasible, even if the simplification hinders the model's application to reality.. The metaphor and variants …

Theoretically, an aerostatic vehicle could be made to use a vacuum or partial vacuum. As early as 1670, over a century before the first manned hot-air balloon flight, the Italian monk Francesco Lana de Terzi envisioned a ship with four vacuum spheres. In a theoretically perfect situation with weightless spheres, a 'vacuum balloon' would have 7% more net lifting force than a hydrogen …

Vacuum systems usually consist of gauges, vapor jet and pumps, vapor traps and valves along with other extensional piping. A vessel that is operating under vacuum system may be any of these types such as processing tank, steam simulator, particle accelerator, or any other type of space that has an enclosed chamber to maintain the system in less ...

An anode is an electrode of a polarized electrical device through which conventional current enters the device. This contrasts with a cathode, an electrode of the device through which conventional current leaves the device.A common mnemonic is ACID, for "anode current into device". The direction of conventional current (the flow of positive charges) in a circuit is …

Pair production is the creation of a subatomic particle and its antiparticle from a neutral boson.Examples include creating an electron and a positron, a muon and an antimuon, or a proton and an antiproton.Pair production often refers specifically to a photon creating an electron–positron pair near a nucleus. As energy must be conserved, for pair production to …