Kirchhoff's third law
Continuous radiation viewed through a low-density gas will produce an absorption-line spectrum.
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Kirchhoff's second law: A low-density gas will radiate an emission-line spectrum with an underlying emission continuum.
Kirchhoff's third law:Continuous radiation viewed through a low-density gas will produce an absorption-line spectrum.
 See also: Continuous Spectrum, Planet, Density, Gravitation, Sky
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