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radians!
'''Natural units''' are units of [[measurement]] that arise when a physical [[constant]], such as [[Planck's constant]] or the [[speed of light]] in a vacuum, is set to a [[dimensionless]] value such as one.<ref>[http://superstringtheory.com/unitsa.html Natural units]</ref>
'''Natural units''' are units of [[measurement]] that arise when a physical [[constant]], such as [[Planck's constant]] or the [[speed of light]] in a vacuum, is set to a [[dimensionless]] value such as one.<ref>[http://superstringtheory.com/unitsa.html Natural units]</ref>
[[Radian]]s used in [[geometry]] are one example of a natural constant, since they are definted so that [[pi]] radians make a half-turn (more widely known as 180 degrees).
==References==
==References==
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[[Category:Physics]]
[[Category:Physics]]