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Definition: Meter

According to the International System of Units (SI), one meter is

the distance travelled by light in a vacuum in \(1 / 299\,792\,458\) seconds. This definition is permissible because of the principle of the constancy of speed of light.

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References

Bibliography

1. Weingärtner, Andreas: "Spezielle Relativitätstheorie - ganz einfach", Books On Demand, 2016