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abstraction > mathematical concept > number > constant > fundamental physical constant > electromagnetic constant > Josephson constant

Josephson constant comparison table

Subject	has equation	is an instance of	has uncertainty	is a kind of	has symbol	has value
electromagnetic constant				fundamental physical constant		changes in value are due solely to an increase in measurement accuracy or convention
Josephson constant		electromagnetic constant	0.019 × 109 Hz V-1		KJ	483597.898 × 109 Hz V-1

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