On This Day In Chemistry

September 28th

The first General Conference on Weights and Measures (CGPM) defined the length of a metre on this day in 1889

One metre was defined as the distance between two lines on a standard bar of an alloy of platinum (Pt) with 10% iridium (Ir), measured at the melting point of ice. The original international prototype of the metre is still kept at the BIPM, Bureau International des Poids et Mesures, in Sèvres, France.

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