Assertion: c's value | /r/HasProperty | fixed at 4π×10−7 h⋅m−1
Facets:
value: exactly
type: DEGREE
value: through the definition of the ampere
type: MANNER
Source sentences:
text: The vacuum permittivity may be determined by measuring the capacitance and dimensions of a capacitor, whereas the value of the vacuum permeability is fixed at exactly 4π×10−7 H⋅m−1 through the definition of the ampere.