物理学在于观察,通过测量予以量化,以单位进行表达。处理物理单位的做法不断演变,与科学家对物理学本身越来越深入的理解有关。目前全球的科学家使用国际单位制。人们很容易认可国际单位制的正确性,而定义和建立一致又实用的单位制是一桩繁重的差事,目前这一维持和发展度量标准的工作主要由全国性度量衡学研究机构完成。度量衡学研究受益于物理学发展的同时,也在推动基 Physics is observed, measured by measurement, expressed in units. The practice of dealing with physical units is evolving and relates to scientists’ deeper and deeper understanding of physics itself. The world’s scientists now use the SI system. It is easy to recognize the validity of the SI system. It is a heavy task to define and establish a consistent and practical system of units. At present, this measure of maintaining and developing the measurement is mainly done by a national metrology institute. Metrology research benefit from the development of physics at the same time, but also to promote the base