Vacuum

void between celestial bodies

thumb|300x300px|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]]

device that controls electric current between electrodes in an evacuated container

equipment producing low air pressure

difference of the energy of an electron at rest at infinity and the Fermi energy

process used to make thin films for semiconductors or surface coating

filter material with homogeneously sized pores in the nanometer range

method of removing air from package prior to sealing

device or object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial vacuum

distillation performed under reduced pressure, which allows the purification of compounds not readily distilled at ambient pressures or simply to save time or energy

ground state of a fermionic field; thought of as a "sea" of negative-energy states that have been all filled in, thus rendering the vaccum stable

background energy existing in space

hypothetical vacuum, less stable than true vacuum

thumb|240x240px|Gasses or liquids that move along a pressure gradient can exert forces on objects. Suction is the day-to-day term for the movement of gases or liquids along a pressure gradient with the implication that the movement occurs because the lower pressure pulls the gas or liquid. However, the forces acting in this case do not originate from just the lower pressure side, but instead from the side of the higher pressure, as a reaction to the pressure difference.

quantum state with the lowest possible energy

Outgassing (sometimes called offgassing, particularly when in reference to indoor air quality) is the release of a gas that was dissolved, trapped, frozen, or absorbed in some material. Outgassing can include sublimation and evaporation (which are phase transitions of a substance into a gas), as well as desorption, seepage from cracks or internal volumes, and gaseous products of slow chemical reactions. Boiling is generally thought of as a separate phenomenon from outgassing because it consists of a phase transition of a liquid into a vapor of the same substance.

type of electrode and part of cold cathode fluorescent lamp

technique to measure pressure

Device used to brew coffee

set of theories

thumb|right|220px|Beamline at Brookhaven National Laboratory. In accelerator physics, a beamline refers to the trajectory of the beam of particles, including the overall construction of the path segment (guide tubes, diagnostic devices) along a specific path of an accelerator facility. This part is either the line in a linear accelerator along which a beam of particles travels, or the path leading from particle generator (e.g. a cyclic accelerator, synchrotron light sources, cyclotrons, or spallation sources) to the experimental end-station.

artificial vacuum with very low pressure

manifestation of nothingness

physical principle that nature contains no vacuums

lowest-energy state of in quantum chromodynamics

lowest-energy state

unit of exposure of an adsorbate/gas to a substrate used in surface science to study adsorption

Method of coating application