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Some of its definitions are below, with values taken from NIST values of the constants:
|Speed of light in vacuum||c0||299 792 458 m s−1||299 792 458 m s−1|
|Magnetic constant||μ0||4π × 10−7 N A−2||12.566 370 614... x 10−7 N A−2|
|Electric constant||ε0||8.854 187 817... x 10−12 F m−1|
|Characteristic impedance of vacuum||Z0||μ0 c0||376.730 313 461...Ω|
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