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abstraction > mathematical concept > number > constant > fundamental physical constant > electromagnetic constant > Bohr magneton
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Bohr magneton comparison table
Subject has uncertainty has definition has equation has value has symbol is a kind of is an instance of
electromagnetic constant   changes in value are due solely to an increase in measurement accuracy or convention fundamental physical constant 
Bohr magneton0.000037 × 10-26 J T-1Magnetic moment of an electron in the first Bohr orbit.927.400899 × 10-26 J T-1μB electromagnetic constant

Next electromagnetic constantconductance quantum    Upelectromagnetic constant    Previous electromagnetic constantvon Klitzing constant