General Conference of Weights and Measures

Gasoline, 583-584 Gay-Lussac, Joseph, 106 General Conference of Weights and Measures, 635... 

SI Units—The International System of Units as defined by the General Conference of Weights and Measures in 1960. These units are generally based on the meter/kilogram/second units, with special quantities for radiation including the becquerel, gray, and sievert. 

The establishing, or fixing, of points for temperature scales is done so that anyone, anywhere can replicate a specific temperature to create or verify a thermometer. The specific temperature points become (in effect) the International Prototypes for heat. The General Conference of Weights and Measures accepted the new International Practical Temperature Scale of 1968 (IPTS 1968) with 13 fixed points (see Table 2.29). The new (IPTS 1968) scale was a revision from the IPTS 1948 (which had been amended in 1960). 

The current International System of Units (SI) is a metric system of measurement which has been adopted internationally by the General Conference of Weights and Measures and is described in an International Standard... 

SI is somewhat different than the CGS system, in use for many years, which has often been called the Metric System. SI is a system adopted internationally by the General Conference of Weights and Measures. Among some of the principles are the use of the kilogram for mass only, and the use of newton for force or weight. 

For years Celsius thermometers were referred to as Centigrade thermometers. However, in 1948, the Ninth General Conference of Weights and Measures ruled that degrees centigrade would be referred to as degrees Celsius in his honor. The Celsius scale is still used today by most scientists. 

For many years scientists recorded measurements in metric units, which are related decimally, that is, by powers of 10. In 1960, however, the General Conference of Weights and Measures, the international authority on units, proposed a revised metric system called the International System of Units (abbreviated SI, from the French 5ysteme /ntemationale d Unites). Table 1.2 shows the seven SI base units. All other units of measurement can be derived from these base units. Like metric units, SI units are modified in decimal fashion by a series of prefixes, as shown in Table 1.3. We will use both metric and SI units in this book. 

The International System of Units (Systeme International SI) was adopted in 1960 by the General Conference of Weights and Measures as a coherent system based on seven basic units the meter, kilogram, second, ampere, kelvin, candela, and mole. In human medicine, the system has not been adopted universally. 

Note, the abbreviation SI means Systeme International d Unites, ref 11 General Conference of Weight and Measures, date I960). The conversion factors shown below can be found in many documents, for example in References I to 7 are a few sources. 

The metric system was begun by the French National Assembly in 1790 and has undergone many modifications. The International System of Units or Systeme International (SI), which represents an extension of the metric system, was adopted by the 11th General Conference of Weights and Measures in 1960. It is constructed from seven base units, each of which represents a particular physical quantity (Table C.l). 

In all branches of science and engineering there is a need for a practical system of units which everyone can use. In 1960, the General Conference of Weights and Measures agreed to an international system called the Systeme International d Unites (abbreviated to SI units). 

All data in this handbook are given in the International System of Units (Systeme International d Unites), abbreviated internationally to SI, which is the modern metric system of measurement and is acknowledged worldwide. The system of SI units was introduced by the General Conference of Weights and Measures (Conference Generate des Poids et Mesures), abbreviated internationally to CGPM, in 1960. The system not only is used in science, but also is dominant in technology, industrial production, and international commerce and trade. 

For many years scientists recorded measurements in metric units, which are related decimally, that is, by powers of 10. In 1960, however, the General Conference of Weights and Measures, the international authority on imits, proposed a revised metric... 

In 1960 the General Conference of Weights and Measures adopted the International System of units (or SI, after the French le Systeme International d Unites), which is a particular choice of metric units. This system has seven SI base units, the SI units from which all others can be derived. Table 1.2 lists these base units and the symbols used to represent them. In this chapter, we will discuss four base quantities length, mass, time, and temperature. ... 

The International Bureau of Weights and Measures located at Sevres, France, serves as a permanent secretariat for the Metric Convention, coordinating the exchange of information about the use and refinement of the metric system. As measurement science develops more precise and easily reproducible ways of defining the measurement units, the General Conference of Weights and Measures—the diplomatic organization made up of adherents to the Convention—meets periodically to ratify improvements in the system and the standards. 

The Council has noted the adoption by the 15th General Conference of Weights and Measures of special names for some units of the Systeme International d Unites (SI) used in the field of ionizing radiation. The gray (symbol Gy) has been adopted as the special name... 

Several systems of measurement are used in chemistry and environmental chemistry. The most systematic of these is the International System of Units, abbreviated SI,aself-corrsistent set of imits based upon the metric system recommended in 1960 by the General Conference of Weights and Measures to simplify and make more logical the many units used in the scientific and engineering communify. Table 1.4 gives the seven base SI units from which all others are derived. 

Two systems of units are used today in the U.S. the traditional English (ES) and the SI (Syst me International d Unites), towards which the country is moving, albeit slowly. (The SI system was introduced in 1960 by the General Conference of Weights and Measures, an international body that meets every six years in Paris.)... 

The system of units that will in time be used universally for expressing all measured quantities is Le Systeme International d Unites (The International System of Units), adopted in 1960 by the Conference Generale des Poids et Measures (General Conference of Weights and Measures). A summary of some of the provisions of the SI convention is provided here. 

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