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随着科学技术的发展和实际生活的需要,各种单位制不断地演变和发展,由繁趋简,由多种化趋向单一化。目前,世界各国都在积极推行国际单位制(SI),以消除多种单位制和多种单位制并存使用而造成的混乱,以此可节约大量的人力和物力,并促进国际间的科技交流。我国也立法规定要使用法定的计量单位,即①国际单位制的基本单位,②国际单位制的导出单位;③国际单位制中具有专门名称的导出单位;④国家选定的非国际单位制单位;⑤由以上单位构成的组合形式的单位;③由词头和以上单位构成的十进倍数和分数单位。
With the development of science and technology and the need of real life, the various unit systems have been constantly evolving and developing from simple to simple and from multiple to single. At present, all countries in the world are actively promoting the International System of Units (SI) so as to eliminate the confusion caused by the coexistence of various unit systems and various system of units. This can save a lot of manpower and material resources and promote international exchange of scientific and technological achievements . Our country also legislates to use statutory units of measurement, namely: ① the basic unit of the International System of Units, ② the unit of export of the unit of measure of the International System of Units; ③ the unit of export with a specific name in the unit of the International System; ④ the unit of State selected by the State, ; ⑤ units composed of the above units in the form of combinations; ③ by the prefix and the units above constitute the decimal multiple and fractional units.