A steel scale is to be prepared such that the millimeter intervals are to be accurate within 6 x 10-5 mm . The maximum temperature variation during the ruling of the millimeter marks (α =12 x 10-6 C-1) is

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A steel scale is to be prepared such that the millimeter intervals are to be accurate within 6 x 10<sup>-5</sup> mm . The maximum temperature variation during the ruling of the millimeter marks (α =12 x 10<sup>-6</sup> C<sup>-1</sup>)  is