NBS Special Publication, Tema 330The Bureau, 1974 |
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Términos y frases comunes
11th CGPM 1st CGPM 9th CGPM adopted amount of substance ampere astronomical base units BIPM Bureau of Standards candela Celsius CGPM considering CIPM Conference considering RESOLUTION Consultative Committee coulomb cubic metre decimal multiples defined definition degree Celsius density derived units expressed farad frequency standards International Atomic International Bureau international prototype International System joule kelvin kg/mol kilogram laboratories length litre luminous intensity Metre Convention metrology mole multiples and sub-multiples National Bureau photometric practical system Procès-verbaux CIPM radiation recommendations Resolution 12 SI base units SI derived units SI prefixes SI units special names special unit employed specific square metre steradian supplementary units System of Units TABLE technical Technology thermodynamic temperature tion triple point U.S. DEPARTMENT unit Name Unit of amount unit of electric unit of luminous unit of mass unit of thermodynamic unit symbols units of measurement watt wavelength Weights and Measures
Pasajes populares
Página 31 - The second is the duration of 9, 192, 631, 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium- 133 atom (13th CGPM, 1967).
Página 35 - The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.
Página 21 - The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 X 10"7 newton per meter of length.
Página 6 - UNITS length meter* (m) mass kilogram (kg) time second (s) electric current ampere (A) thermodynamic temperature* kelvin (K) amount of substance mole (mol) luminous intensity candela (cd) SUPPLEMENTARY UNITS plane angle radian (rad) solid angle steradian (sr) tThe spellings "metre" and "litre" are preferred by ASTM; however, "-er
Página 11 - Supplementary unit, the steradian, is the solid angle which, having its vertex in the center of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.
Página 26 - The metre is the length equal to 1 650 763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2p,0 and 5d5 of the krypton-86 atom.
Página 3 - The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.