[2.14] The distance between two successive points of a periodic wave in the direction of propagation, in which the oscillation has the same phase. The three commonly used units are:

Name	Symbol	Value
micrometer (micron)*	μm	1 μm = 10-6 m
nanometer	nm	1 nm = 10-9 m
Ångstrom*	Å	1 Å = 10-10 m

^* Deprecated.

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