Question

which alloy is used first to measure the distance between two marks
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Answer 1

Answer:

iridium alloy

It is realistically represented by the distance between two marks on an iron bar kept in Paris. The International Bureau of Weights and Measures, created in 1875, upgraded the bar to one made of 90 percent platinum/10 percent iridium alloy.

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Answer 2

Answer:

24–28 September 1889 – The 1st General Conference on Weights and Measures (CGPM) defines the metre as the distance between two lines on a standard bar of an alloy of platinum with 10% iridium, measured at the melting point of ice.

Unit of: length

Unit system: SI base unit

SI units: 1000 mm; 0.001 km