| This autostub has not yet had its initial copyediting proof and may contain significant formatting and even factual errors. You can improve Exodictionary by cleaning up the page markup and verifying that the definition is correct and then removing this tag.
| This autostub has not yet had its initial categorization proof and may be categorized incorrectly. You can improve Exodictionary by removing inappropriate categories and then removing this tag.
The reciprocal of wavelength;
the number of waves per unit distance in the direction of propagation;
or, sometimes 2π times this quantity.
In spectroscopy, wave number is usually expressed in reciprocal
centimeters, as 100,000 cm-1 (100,000 per centimeter).
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use