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Material properties are affected by temperature. This can be a major obstacle when, for instance, measuring precise lengths with a metal ruler. If the ruler was calibrated by one laboratory at a reference temperature— say 15°C—but then used at a different temperature in another laboratory, then the calibration certificate might include the value of the ruler's coefficient of thermal expansion, so...
The necessary steps towards a redefinition of the kilogram according to CCM Recommendation G1 (2013) are described. The redefinition may occur by 2018. The CCM roadmap contains in particular the timing for extraordinary calibrations using the IPK, a pilot study, drafting of the new mise en pratique and the publication of supporting work in a special edition of Metrologia.
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