3199 Unit Frur . International System of Units READING PASSAGE International Sys

Question

3199 Unit Frur . International System of Units READING PASSAGE International System of Units International system of unit is the name adopted by the Eleventh General Conference on Weights and Measures, held in Pacis in 1960, for a universal, unied, self-consistent system of measurement units based on the MKS (meter-kilogram-second) system The international system is commonly referred to throughout the world as SI, after the initials of Systome International. The Metric Conversion Act of 1975 commits the United States to the increasing use of, and voluntary conversion to, the metric system of measurement, further defining metric system as the International System of Units as interpreted or modified for the United States by the secretary of commerce. At supplementary units7a seventh base unit, the mole, was added in 1971. The names of these units are exactly the same in all anguages ain unit ofj distangis thelmeter ther units of distance are always obtained by multiplying the meter by 10 or a multiply of 10. Thanks to our system of writing numbers, this means that conversion of one unit to another within the metric s can be carried out by shifts of decimal poimt ystem units of length in use today such as mete inct (footmile ly defined in terms of the distance from the North Pole to metersfihe standard meter of et the equator; this distance is closed to 10,000 kilometers or 107 the world is the distance between two Scratiches on a platinum- alloy bar which is kept at the International Bureau of Weight and Measures in France. However, there is a unit of length in Nature which is much more accurate than the distance between two scratches on a piece of metal. This wavelengthof light from an has been calibrated in terms of the number of wavelengths of light of a certain spectral line. ral line the standard meter in France 39.3 mile centime 30

Explanation / Answer

1) The main aim of the conference held in paris is to develope an International system of unit for a unified self - consistent system of measurement units based on the MKS system.

2) Six base units and two supplementry units were defined.

3) We can use multiplying prefixes to express the size of a measurement by using a multiplying prefix. For example, 1 m = 100 cm; 1 cm = 10 mm etc.

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