The freezing point of copper has been determined using the NPL photon-counting pyrometer. Measurements made on two high-purity ingots at four wavelengths from 660 nm to 812 nm gave a value for the freezing point of 1358.02K (1084.87 degrees C), with an overall uncertainty at the 99% confidence level of +or-0.04K.
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Coates et al. (1978) studied this question.
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