Editing Ultraviolet–visible spectroscopy (section)

== Additional applications ==
UV-Vis can be applied to characterize the rate of a [[chemical reaction]]. Illustrative is the conversion of the yellow-orange and blue isomers of mercury dithizonate. This method of analysis relies on the fact that concentration is linearly proportional to concentration.  In the same approach allows determination of equilibria between chromophores.<ref>{{cite journal |last1=Sertova |first1=N. |last2=Petkov |first2=I. |last3=Nunzi |first3=J.-M. |title=Photochromism of mercury(II) dithizonate in solution |journal=Journal of Photochemistry and Photobiology A: Chemistry |date=June 2000 |volume=134 |issue=3 |pages=163–168 |doi=10.1016/s1010-6030(00)00267-7 }}</ref><ref>{{cite web|title=The Rate Law|url=http://chemwiki.ucdavis.edu/Physical_Chemistry/Kinetics/Rate_Laws/The_Rate_Law|website=ChemWiki|access-date=2014-11-11|author=UC Davis|date=2013-10-02}}</ref> 

From the spectrum of burning gases, it is possible to determine a chemical composition of a fuel, temperature of gases, and air-fuel ratio.<ref>{{cite journal |last1=Mekhrengin |first1=M.V. |last2=Meshkovskii |first2=I.K. |last3=Tashkinov |first3=V.A. |last4=Guryev |first4=V.I. |last5=Sukhinets |first5=A.V. |last6=Smirnov |first6=D.S. |title=Multispectral pyrometer for high temperature measurements inside combustion chamber of gas turbine engines |journal=Measurement |date=June 2019 |volume=139 |pages=355–360 |doi=10.1016/j.measurement.2019.02.084 |bibcode=2019Meas..139..355M |s2cid=116260472 }}</ref>