## Guide for the Use of the International System of Units (SI): The Metric SystemA basic introduction to the metric system. Covers: the three classes of SI units & the SI prefixes; units outside the SI; rules & style conventions for printing & using units; rules & style conventions for expressing values of quantities; comments on some quantities & their units; rules & style conventions for spelling unit names; printing & using symbols & numbers in scientific & technical documents; & check list for reviewing manuscripts. Appendix: definitions of SI base units & the radian & Steradian; conversion factors, & comments on the references of the SI for the U.S. Extensive bibliography. |

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03 British thermal acceptable units amount of substance ampere atomic mass unit avoirdupois base units based on U.S. British thermal unitrr Celsius CGPM cubic meter kg/m3 cubic meter m3 degree Celsius derived units digits electric example express the values Fahrenheit foot degree Fahrenheit gallon U.S. hour square foot International italic type joule joule per kilogram kelvin per watt kilogram kilogram kelvin J/(kg kilogram kg kilogram per cubic kilogram-force kilopascal kilopascal kPa liter MASS DIVIDED meter per second metric mile millimeter molar multiples and submultiples newton meter NIST pascal second pound pound-force prefix symbols Quantities and units quantity symbols radian rules and style second m/s SI base units SI derived units SI prefixes SI unit special names square centimeter square foot degree square inch square meter kelvin square meter W/m2 standard steradian style conventions temperature U.S. survey foot unit symbol unit,h values of quantities volume watt per square

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Page 40 - 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 40 - When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.

Page 35 - Name alpha beta gamma delta epsilon zeta eta theta iota kappa lambda mu nu xi omicron Pi...

Page 40 - 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 40 - The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.

Page 14 - Among the base and derived units of SI, the unit of mass (kilogram) is the only one whose name, for historical reasons, contains a prefix. Names of decimal multiples and submultiples of the unit of mass are formed by attaching prefixes to the word gram (g). 2 From the French name, Le Systeme International d'Unites. 3 "Quantity" as used in the headings of the tables of this standard means measurable attribute of phenomena or matter.

Page 40 - 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.

Page 4 - Symbol length mass time electric current thermodynamic temperature'* amount of substance luminous intensity metre kilogram second ampere kelvin mole candela m kg • s A K mol cd...

Page 40 - The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of (1/683) watt per steradian.

Page 6 - Heat flux density, irradiance Heat capacity, entropy Specific heat capacity, specific entropy Specific energy Thermal conductivity Energy density Electric field strength Electric charge density Electric flux density Permittivity Permeability Molar energy Molar entropy, molar heat capacity...