Algor mortis
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Algor mortis (Latin: algor—coolness; mortis—death) is the reduction in body temperature following death. This is generally a steady decline until matching ambient temperature, although external factors can have a significant influence.
A measured rectal temperature can give some indication of the time of death. The Glaister equation, for example, is (98.4° F − rectal temperature)/1.5, giving hours elapsed since death.
As decomposition occurs the internal body temperature tends to rise again.