## The International System of Units (Si): The Metric System |

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### Common terms and phrases

11th CGPM 9th CGPM absorbed dose adopted amount of substance ampere base units BIPM BIPM Proc-Verb candela Celsius CIPM CIPM recommends Conference considering Consultative Committee corresponding decimal multiples defined Definition abrogated degree Celsius derived units dose equivalent electric units electromotive force International Atomic International des Poids international prototype International System ionizing radiation Josephson effect joules per kilogram kelvin kilogram laboratory reference standards laser length liter luminous intensity Meter Convention metric mole multiples and submultiples names and symbols newton photometric physical Poids et Mesures practical system quantum Hall effect realization Resolution 12 SI base units SI derived units SI prefixes SI units sievert solid angle special names special unit employed specified square meter steradian supplementary units System of Units thermodynamic temperature thermometers triple point unit of mass unit of thermodynamic unit symbols units of measurement USA Editor's note watt wavelength Weights and Measures

### Popular passages

Page 4 - 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.

Page 3 - 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).

Page 36 - The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10" hertz and that has a radiant intensity in that direction of (1/683) watt per steradian...

Page 5 - 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.

Page 25 - 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...

Page 4 - The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water (13th CGPM, 1967).

Page 17 - The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.

Page 24 - 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.

Page 3 - The metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.

Page 18 - The joule is the work done when the point of application of a force of one newton is displaced a distance of one metre in the direction of the force.