The Conférence générale des poids et mesures (General Conference on Weights and Measures or CGPM) is one of the three organizations established to maintain the SI system under the terms of the Metre Convention (1875). It meets in Paris every four to six years. In 2002 the CGPM represented 51 member states and ten further associate members (1).
3rd (1901) - Litre redefined as volume of 1 kg of water. Clarified that kilograms are units of mass, "standard weight" defined, standard acceleration of gravity defined endorsing use of grams force and making them well-defined.
11th (1960) - metre redefined in terms of wavelengths of light. Hertz, lumen, lux, tesla adopted. New metric system given the official symbol SI for Système International d'Unités, the "modernized metric system". Prefixes pico-, nano-, micro-, mega-, giga- and tera- confirmed.
12th (1964) - original definition of litre = 1 dm³ restored. atto- and femto- prefixes.
13th (1967) - second redefined as 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 caesium-133 atom at a temperature of 0 K. Degree Kelvin renamed kelvin. Candela redefined.
15th (1975) - peta- and exa- prefixes. Gray and becquerel radiological units.
16th (1979) - candela, sievert defined. Both l and L provisionally allowed as symbols for litre.
17th (1983) - metre redefined in terms of the speed of light, but keeps same length.
18th (1987) - conventional values adopted for Josephson constant, KJ, and von Klitzing constant, RK, preparing the way for alternate definitions of the ampere and kilogram.
The new CPGM institutionalizes the agencyÂ’s inspections and provides specific guidance to the over 800 federal and state feed investigators responsible for surveillance, compliance and enforcement of the BSE feed rule.
FDA prepares and releases CPGMs for each area of its jurisdiction, and the BSE feed rule had been lumped together with the CPGM for medicated feed and veterinary feed directive (VFD).
The announcement and actual CPGM can be found on FDAÂ’s website at: www.fda.gov/cvm/index/updates/bsecp.htm Although the document appears quite lengthy, the substantive portion of the guide is only about 25 pages.
In a constant gravitational field like the Earth's, this force is proportional to the object's mass, and as a result the terms are often used interchangeably and indeed went historically undistinguished.
The CPGM recommends that the word 'weight' be used to refer only to force, and not to mass.
The verb 'to weigh' however may be used for mass determinations.
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