Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

equivalent width




A measure of the strength of a spectral line. On a plot of intensity against wavelength, a spectral line appears as a curve with a shape defined by the line profile. The equivalent width is the width of a rectangle centered on a spectral line that, on a plot of intensity against wavelength, has the same area as the line.


Related categories

   • SPECTRA AND SPECTROSCOPY