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国际度量衡委员会在1989年9月召开的会议上采纳了ITS-90温标。用这个温标取代1968年国际实用温标(IPTS-68),並于1990年1月1日起生效。ITS-90比以往的温标(IPTS-68、IPTS-48等)更接近于热力学温标。 对海洋学家来说,最感兴趣的是ITS-90在-2℃～35℃范围内的性质。唯一最重要的性质就是水的三态点仍然取在273.16K或0.010℃,保持不变。但在标准大气压下,水的沸点却降低到99.974℃。从而造成在0℃～100℃的范围内,根据ITS-90标度测量的温度要比根
The International Metrology Committee adopted the ITS-90 temperature scale at its meeting in September 1989. The temperature scale was used to replace the 1968 International Practical Temperature Scale (IPTS-68) and came into effect on January 1, 1990. ITS-90 than the previous temperature scale (IPTS-68, IPTS-48, etc.) closer to the thermodynamic temperature scale. For oceanographers, the most interesting is the nature of ITS-90 in the range of -2 ° C to 35 ° C. The single most important property is that the water’s triplet point still remains at 273.16K or 0.010C. However, at normal atmospheric pressure, the boiling point of water is reduced to 99.974 ° C. Resulting in temperatures ranging from 0 ° C to 100 ° C as measured by the ITS-90 scale