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abstraction > mathematical concept > number > constant > fundamental physical constant > universal constant > magnetic constant
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magnetic constant comparison table
Subject is an instance of has uncertainty is a kind of has symbol has value
universal constant  fundamental physical constant changes in value are due solely to an increase in measurement accuracy or convention
magnetic constantuniversal constant0 μ04π × 10-7 = 12.566 370 614 × 10-7 N A-2

Next universal constantNewtonian constant of gravitation    Upuniversal constant    Previous universal constantGaussian gravitational constant