International System
units of measure

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International System of units
Is at least obligatory to dedicate some lines to the INTERNATIONAL SYSTEM, and its constitution. All it is born from the requirement to use common units of measure for the quantification and the measure of the physical quantity, for favor the commercial exchanges and the scientific studies, between persons of the same, or different nation. To such sense in 1875, in those of Paris, the single representatives of 17 countries, gathered in order to approve of the CONVENTION on the METER, and consequently to adopt the Units for the Measure of the lengths. In contemporary the international organism of the metrology saw the light also: the Conférence Générale des Poids et Mésures (CGPM). In the course of the years they have been inserted other fundamental units, until arriving to the 7 fundamental quantity, with the 2 additional units currently in use in International System, multiple and the decimal submultiples, and the other derived units. Finally it is worth the pain remembering that in Europe before the adoption of the metric system they were used, in order to determine the distances, is the inch (inch) that the foot (foot):
in France, 1 inch = 2.708 cm; 1 foot = 32.5 cm
in Germany, 1 inch = 2.6 cm; 1 foot = from 25 to 34 cm
in Russia, 1 foot = 30 cm.
To notice that in Italy the inch Anglo-Saxon is, for some measures standardized, still widely used, in such sense go cited the
diameter of the tubes to hydraulic use, the height of the magnetic tapes, the floppy disk, etc.
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