(Kirchhoff's three laws of spectroscopy)
(laws regarding the source of spectral lines)
Kirchhoff's laws (Kirchhoff's three laws of spectroscopy)
indicate the source of spectral lines.
- A hot solid, liquid, or dense gas produces a continuous spectrum.
- A hot thin (i.e., low density) gas produces emission lines.
- A continuous spectrum passing through a cold thin gas produces absorption lines.
The developer, physicist Gustav Kirchhoff, also devised other groups of laws
now with his name, e.g., "Kirchhoff's laws" of circuits.