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The Permeability of Vacuum and the Revised International System of Units
IEEE Magnetics Letters ( IF 1.2 ) Pub Date : 2017-01-01 , DOI: 10.1109/lmag.2017.2777782
Ronald B Goldfarb 1
Affiliation  

The International System of Units (SI) is expected to be revised such that all seven base units, including the kilogram, will be defined in terms of fixed numerical values of seven defining constants. The revised SI will include a redefinition of the ampere. One consequence is that the permeability of vacuum will not have a fixed numerical value but will become, in principle, a measurable quantity. The constitutive relation among magnetic flux density, magnetic field strength, and magnetization will not change. However, its expression in the centimeter-gram-second system of electromagnetic units (EMU), where the permeability of vacuum is unity, will no longer be ontologically equivalent, and quantities will not be exactly convertible to the SI. Already contrary to international convention, the still common EMU system will become obsolete.

中文翻译:

真空渗透率和修订后的国际单位制

国际单位制 (SI) 预计将进行修订,以便所有七个基本单位,包括千克,都将根据七个定义常数的固定数值进行定义。修订后的 SI 将包括对安培的重新定义。一个后果是真空的渗透率将没有固定的数值,但原则上会变成一个可测量的量。磁通密度、磁场强度和磁化强度之间的本构关系不会改变。然而,它在厘米-克-秒电磁单位系统 (EMU) 中的表达,其中真空的磁导率为 1,将不再在本体论上等效,并且数量将无法准确地转换为 SI。已经与国际惯例背道而驰的,仍然通用的动车组系统将变得过时。
更新日期:2017-01-01
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