Metre scale of platinum and iridium scale is preserved at 0 C. Give reason.
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The formal definition of the meter has gone through several changes. From 1927 to 1960 it was defined as the distance, at 0° Celsius, between the axes of two central lines marked on a reference bar of platinum-iridium held in controlled conditions by the BIPM (the international body governing weights and measures)
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The formal definition of the meter has gone through several changes. From 1927 to 1960 it was defined as the distance, at 0° Celsius, between the axes of two central lines marked on a reference bar of platinum-iridium held in controlled conditions by the BIPM (the international body governing weights and measures).
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