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dimensionless constant

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  • Dimensionless physical constant — In physics, a dimensionless physical constant (sometimes fundamental physical constant) is a universal physical constant that is dimensionless having no unit attached, so its numerical value is the same under all possible systems of units. The… …   Wikipedia

  • Dimensionless quantity — In dimensional analysis, a dimensionless quantity or quantity of dimension one is a quantity without an associated physical dimension. It is thus a pure number, and as such always has a dimension of 1.[1] Dimensionless quantities are widely used… …   Wikipedia

  • dimensionless — adjective a) lacking dimensions Iron has a density of 7.8g/cc: its dimensionless relative density is 7.8. b) of a physical constant, lacking units …   Wiktionary

  • dimensionless — di·men·sion·less (dĭ menґshən ləs) denoting a numerical constant or variable that has no units of measurement …   Medical dictionary

  • Physical constant — A physical constant is a physical quantity that is generally believed to be both universal in nature and constant in time. It can be contrasted with a mathematical constant, which is a fixed numerical value but does not directly involve any… …   Wikipedia

  • Fine-structure constant — The fine structure constant or Sommerfeld fine structure constant, usually denoted alpha ,, is the fundamental physical constant characterizing the strength of the electromagnetic interaction.It is a dimensionless quantity, and thus its numerical …   Wikipedia

  • fine-structure constant — A dimensionless constant, equal to 7.297351 x 10 3 (approximately 1/137), given by 2π times the square of the electron charge, divided by the product of the speed of light and Planck s constant …   Dictionary of automotive terms

  • fine-structure constant — ¦ ̷ ̷ ˈ ̷ ̷  ̷ ̷ noun : a dimensionless constant that is a measure of the strength of electromagnetic interactions of subatomic particles and that has an approximate value of 0.0073 or 1/137 symbol α …   Useful english dictionary

  • Coupling constant — For the Murray von Neumann coupling constant, see von Neumann algebra. For the coupling constant in NMR spectroscopy, see NMR spectroscopy and/or Proton NMR. In physics, a coupling constant, usually denoted g, is a number that determines the… …   Wikipedia

  • Acid dissociation constant — Acetic acid, a weak acid, donates a proton (hydrogen ion, high …   Wikipedia

  • Gravitational coupling constant — The gravitational coupling constant, αG, is a fundamental physical constant, the coupling constant characterizing the gravitational attraction between two elementary particles with charge and nonzero mass. αG is also a dimensionless quantity, so… …   Wikipedia

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