与我们日常生活密切相关的基本变量,诸如时间、距离、重量、温度等都可追朔至最终的基准。英国物理研究所(NPL)负责保存这些基准。准确测温是现代工业的一个非常重要方面,而热电偶是一种常用于-200～1600℃范围 Basic variables closely related to our daily life, such as time, distance, weight, temperature, etc. can be traced back to the final benchmark. The British Institute of Physics (NPL) is responsible for keeping these benchmarks. Accurate temperature measurement is a very important aspect of modern industry, and the thermocouple is a commonly used in -200 ~ 1600 ℃ range