Spectrum analysis, also known as emission spectrochemical analysis, is the original scientific method of charting and analyzing the chemical properties of matter and gases by looking at the bands in their optical spectrum. The empirical laws of spectrum analysis are commonly known as Kirchhoff's Three Laws of Spectroscopy as follows:
* 1. A hot solid, dense gas produces a continuous spectrum.
* 2. A hot, low-density gas produces an emission-line spectrum.
* 3. A continuous spectrum source viewed through a cool, low-density gas produces an absorption-line spectrum.
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