[ Bentley Publishers] Bosch Automotive Handbook(b Ok.org)

Electronic Automotive Handbook 1. Edition © Robert Bosch GmbH, 2002 Choose a chapter in the table of contents or start with the first page. 页码，1/1 Titelseite 2008-1-13 file://D:\bosch\bosch\daten\eng\titel.html

Basic principles, Physics Quantities and units SI units SI denotes "Système International d'Unités" (International System of Units). The system is laid down in ISO 31 and ISO 1000 (ISO: International Organization for Standardization) and for Germany in DIN 1301 (DIN: Deutsches Institut für Normung – German Institute for Standardization). SI units comprise the seven base SI units and coherent units derived from these base Sl units using a numerical factor of 1. Base SI units Base quantity and symbols Base SI unit Name Symbol Length l meter m Mass m kilogram kg Time t second s Electric curr

of atoms of the 133Cs nuclide (13th CGPM, 1967.1) 1 ampere is defined as that constant electric current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-sections, and placed 1 meter apart in a vacuum will produce between these conductors a force equal to 2 · 10–7 N per meter of length (9th CGPM, 1948.1) 1 kelvin is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point2) of water (13th CGPM