Abstract
This paper describes the realization of the International Temperature scale of 1990 from 1,2 K to 2473 K at the National Institute of Metrology (NIM), China, and gives the uncertainties in each range of the scale. Results of recent research in thermometry at the NIM are also reported. The non-uniqueness of SPRTs over the temperature range 13 K to 419 C and the nonlinearity of radiation thermometers have been investigated at the NIM. The results of international comparisons of the triple points of water and freezing points of silver between the NIM, the National Institute of Standards and Technology (NIST), USA, and the Nederlands Meetinstituut (NMi), the Netherlands, are presented.
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