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一、引言 自从1927年第一个国际温标问世至今已有半个多世纪了。在这期间经过两次大的修改,即1948年国际温标和1968年国际实用温标,小的修改有许多次。1927年和1948年两个温标下限温度为氧沸点(-182.97℃)。六十年代末低温和超导技术的应用深入到国民经济很多领域。国际温标下限为氧沸点已经不适应各方面的需要,迫切要求温标往下
I. INTRODUCTION It has been more than half a century since the first international temperature scale was introduced in 1927. During this period, two major changes were made, namely, the 1948 International Temperature Scale and the 1968 International Practical Temperature Scale, with minor changes many times. 1927 and 1948 two temperature scale lower limit of the oxygen boiling point (-182.97 ℃). The application of low-temperature and superconducting technology in the late 1960s went deep into many areas of the national economy. International temperature scale lower limit of oxygen boiling point has not meet the needs of all sectors, the urgent requirement of temperature scale down