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abstraction > mathematical concept > number > constant > fundamental physical constant > universal constant > electric constant
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electric 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
electric constantuniversal constant0 ε08.854187817 × 10-12 F m-1

Next universal constantGaussian gravitational constant    Upuniversal constant    Previous universal constantcharacteristic impedance of vacuum