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The boiling and triple points of oxygen have been realized with absolute uncertainties (at the 67% confidence level) estimated at 0.1 mK in both cases. The work completes the implementation at NPL of the International Practical Temperature Scale of 1968. Sources of error are examined in detail, with particular attention paid to the effects of impurities. Although these have been studied experimentally, the results are believed to have been perturbed by persistent sample inhomogeneities.
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Compton et al. (1976) studied this question.
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