Feel free to contact us for any feedback.Silver Price Guide WHAT MAKES SILVER A PRECIOUS METAL? Lenntech BV is not responsible for programming or calculation errors on this sheet. The English institution for measurement standards is the National Physical laboratory (NPL). The official institution in the US is The National Institute of Standards & Technology (NIST). The official institution from the world standard of measurements is Conférence Générale des Poids et Mesures (CGPM). The institution in The Netherlands that controls the units is Nederlands Meetinstituut (NMi). You can see more on, or on the official site of the BIPM. In 1960, on the 11 th CGPM, the system was named officially International d'Unité. Because more and more countries were interested in the French system, the Bureau International des Poids et Mesures (BIPM) was founded, nowadays: Conférence Générale des Poids et Mesures (CGPM). Only in 1875 the world was beginning to show some interest in the French development.
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