【摘要】：正在美國國家標準與技術研究院(NIST)最新型號的瓦特天平NIST-4已首次完成了普朗克常數(shù)(h)的測量,結(jié)果是h=6.62606983×10~(-34)J·s。這一高精度的結(jié)果足以被用來準確地定義國際單位制中的"千克"。近130年來,千克的國際定義是基于一塊鉑銥金屬,它存放在巴黎國際度量衡局(BIPM)。這個國際千克原器一直被認定是國際單位制(SI)的基礎。盡管千克原器的保存環(huán)境受到嚴格控制,鉑銥金屬其表面仍不可避免地會發(fā)生氧化,從而導致質(zhì)量損耗�？茖W界一直想用一種基于
[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
【分類號】：TB91

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