The first real length standard, adopted more than 200 years ago, was platinum bar with two very fine marks separated by what was defined to be exactly one meter. If this standard bar was to be accurate to within ± 1.0 μm, how carefully would the trustees have needed to control the temperature? The coefficient of linear expansion is 9 × 10 − 6 / C o .

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Chapter 13, Problem 82GP

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The first real length standard, adopted more than 200 years ago, was platinum bar with two very fine marks separated by what was defined to be exactly one meter. If this standard bar was to be accurate to within $\pm$ 1.0 μm, how carefully would the trustees have needed to control the temperature? The coefficient of linear expansion is $9 \times 10^{- 6} / C^{o}$ .

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