evacuated chamber
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ionization chamber — n a partially evacuated tube provided with electrodes so that its conductivity due to the ionization of the residual gas reveals the presence of ionizing radiation * * * a device for measuring ionizing radiation by the measurement of the… … Medical dictionary
ionization chamber — noun Date: 1904 a partially evacuated tube provided with electrodes so that its conductivity due to the ionization of the residual gas reveals the presence of ionizing radiation … New Collegiate Dictionary
spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… … Universalium
particle accelerator — accelerator (def. 7). [1945 50] * * * Device that accelerates a beam of fast moving, electrically charged atoms (ions) or subatomic particles. Accelerators are used to study the structure of atomic nuclei (see atom) and the nature of subatomic… … Universalium
Mass deacidification — is a term used in Library and Information Science for one possible measure against the degradation of paper in old books (the so called slow fires ). The goal of the process is to increase the pH of acidic paper on a large scale. Although acid… … Wikipedia
Synchrotron — A synchrotron is a particular type of cyclic particle accelerator in which the magnetic field (to turn the particles so they circulate) and the electric field (to accelerate the particles) are carefully synchronized with the travelling particle… … Wikipedia
molecular beam — Physics. a stream of molecules freed from a substance, usually a salt, by evaporation and then passed through a narrow slit for focusing, for investigating the properties of nuclei, atoms, and molecules. Also called molecular ray. * * * ▪ physics … Universalium
barometer — barometric /bar euh me trik/, barometrical, adj. barometrically, adv. /beuh rom i teuhr/, n. 1. Meteorol. any instrument that measures atmospheric pressure. Cf. aneroid barometer, mercury barometer. 2. anything that indicates changes … Universalium
cyclotron — /suy kleuh tron , sik leuh /, n. Physics. an accelerator in which particles are propelled in spiral paths by the use of a constant magnetic field. [1930 35; CYCLO + TRON] * * * Particle accelerator that accelerates charged atomic or subatomic… … Universalium
aneroidbarometer — aneroid barometer Expansion or contraction of the vacuum chamber, caused by a change in air pressure, forces the pointer to move. Precision Graphics n. A barometer in which variations of atmospheric pressure are indicated by the relative bulges… … Universalium
centrifuge — centrifugation /sen trif yeuh gay sheuhn, trif euh /, n. /sen treuh fyoohj /, n., v., centrifuged, centrifuging. n. 1. an apparatus that rotates at high speed and by centrifugal force separates substances of different densities, as milk and cream … Universalium
