用瓦特天平精确测量普朗克常数——重新定义千克
发布时间：2018-09-14 07:59
【摘要】：正在美国国家标准与技术研究院(NIST)最新型号的瓦特天平NIST-4已首次完成了普朗克常数(h)的测量,结果是h=6.62606983×10~(-34)J·s。这一高精度的结果足以被用来准确地定义国际单位制中的"千克"。近130年来,千克的国际定义是基于一块铂铱金属,它存放在巴黎国际度量衡局(BIPM)。这个国际千克原器一直被认定是国际单位制(SI)的基础。尽管千克原器的保存环境受到严格控制,铂铱金属其表面仍不可避免地会发生氧化,从而导致质量损耗。科学界一直想用一种基于
[Abstract]:The Planck constant (h) has been measured for the first time by the Watt balance NIST-4 of the latest model of the National Institute of Standards and Technology (NIST). The result is that h = 6.62606983 x 10-34 J.s. This high-precision result is sufficient to accurately define the "kilogram" in the International System of Units. For nearly 130 years, the international definition of kilogram has been based on a piece of platinum. Iridium, deposited in the International Bureau of Metrics and Measures (BIPM) in Paris. This international kilogram prototype has long been recognized as the basis of the International System of Units (SI). Despite strict control of the storage environment, platinum and iridium metals inevitably oxidize on their surfaces, leading to mass loss. The scientific community has always wanted to use a base
【分类号】：TB91
[Abstract]:The Planck constant (h) has been measured for the first time by the Watt balance NIST-4 of the latest model of the National Institute of Standards and Technology (NIST). The result is that h = 6.62606983 x 10-34 J.s. This high-precision result is sufficient to accurately define the "kilogram" in the International System of Units. For nearly 130 years, the international definition of kilogram has been based on a piece of platinum. Iridium, deposited in the International Bureau of Metrics and Measures (BIPM) in Paris. This international kilogram prototype has long been recognized as the basis of the International System of Units (SI). Despite strict control of the storage environment, platinum and iridium metals inevitably oxidize on their surfaces, leading to mass loss. The scientific community has always wanted to use a base
【分类号】：TB91
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