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长度是物理学上最基本的物理量,我国国务院已明文规定采用国际公制统一全国的计量单位。国际公制中长度的基本单位是“米”。1889年第一届国际权度大会规定了“米”的长度,就是保存在国际权度总局的第6号“铂铱米原器”上两条刻线间的距离。这定义使用了约70年,直至1960年10月第十一届国际权度大会对米定义重新作了规定,废除上述旧的米定义,而规定以氪同位素86原子(Kr)~(86)在无骚动下辐射的橙黄谱线(原子光谱学上以光谱项2P_(10)—5D_5表示)
Length is the most basic physics in physics, China’s State Council has expressly provided for the use of international standards of unification of the country’s units of measurement. The basic unit of length of international metricism is “meter.” The first international congress in 1889 stipulated the length of “m”, which is the distance between the two engraved lines preserved in No. 6 “Platinum Iridium Meter” of the General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China. This definition was used for about 70 years until the Eleventh International Congress of the Eleventh Congress in October 1960 regularized the definition of meters, repealing the old definition of meters and providing that the krypton isotopes of 86 atoms (Kr) to (86) The yellow line of orange radiated without disturbance (atomic spectroscopy as 2P_ (10) -5D_5)