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In chemistry, chemical purity is the measurement of the amount of impurities found in a sample. Several grades of purity are used by the scientific, pharmaceutical, and industrial communities. Several grades of purity are used by the scientific, pharmaceutical, and industrial communities.
The purity of a normalized quantum state satisfies , [1] where is the dimension of the Hilbert space upon which the state is defined. The upper bound is obtained by tr ( ρ ) = 1 {\displaystyle \operatorname {tr} (\rho )=1\,} and tr ( ρ 2 ) ≤ tr ( ρ ) {\displaystyle \operatorname {tr} (\rho ^{2})\leq \operatorname {tr} (\rho ...
Purity, the proportion of a named pure substance in a sample (by weight, mass, volume, or count) Fineness, several units of purity of precious metals; Nine (purity), an informal unit of purity; Purity, the colorfulness of a light source; Purity (quantum mechanics), a measure of correlation between a system and its environment
Hydrogen can be purified by passing through a membrane composed of palladium and silver. Permeability of the former to hydrogen was discovered back in the 1860s. [2] An alloy with a ca. 3:1 ratio for Pd:Ag is more structural robust than pure Pd, which is the active component that allows the selective diffusion of H 2 through it.
Cleanness (Middle English: Clannesse) is a Middle English alliterative poem written in the late 14th century. Its unknown author, designated the Pearl poet or Gawain poet, also appears, on the basis of dialect and stylistic evidence, to be the author of Sir Gawain and the Green Knight, Pearl, and Patience, and may have also composed St. Erkenwald.
A classical result, Zariski–Nagata purity of Masayoshi Nagata and Oscar Zariski, [1] [2] called also purity of the branch locus, proves that on a non-singular algebraic variety a branch locus, namely the set of points at which a morphism ramifies, must be made up purely of codimension 1 subvarieties (a Weil divisor).
Purity of Essence, a phrase originating from the film Dr. Strangelove, may refer to: Purity of Essence (Hoodoo Gurus album), 2010; Purity of Essence, an album by ...
Spectral purity is a term used in both optics and signal processing. In optics, it refers to the quantification of the monochromaticity of a given light sample. [ 1 ] This is a particularly important parameter in areas like laser operation and time measurement.