An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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magnetic constant
  پایای ِ مغناتیسی  
pâyâ-ye meqnâtisi (#)
Fr.: constante magnétique  

A physical constant relating mechanical and electromagnetic units of measurement. It has the value of 4π × 10-7 henry per meter. Also called the permeability of free space, or → absolute permeability.

See also: → magnetic; → constant.