一、前言温度基准本来是不便于运输的,最近在标准传递上对精度的要求又很严,而且测量对象也扩大起来,这样,问题就越来越显得突出。温度定点(纯物质的沸点、凝固点、三相点等)自从有温度计以来一直被作为“依据自然现象的基准”应用下来。尽管如此,从技术的现状来考虑,还有必要再从精度和实用性方面进行探讨。日本计量研究所低温室 I. INTRODUCTION Temperature benchmarking was inherently inconvenient to transport. Recently, the accuracy requirements of standard delivery were very strict, and the objects of measurement were expanded. As a result, the problem became more and more prominent. Temperature set point (pure substance boiling point, freezing point, three-phase point, etc.) has been used as a “basis for natural phenomena” since there was a thermometer. In spite of this, considering the status quo of the technology, it is necessary to discuss accuracy and practicability. Japan Institute of Measurement cryogenic chamber