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Algor mortis (from Latin algor 'coldness' and mortis 'of death'), the third stage of death, is the change in body temperature post mortem, until the ambient temperature is matched. This is generally a steady decline, although if the ambient temperature is above the body temperature (such as in a hot desert), the change in temperature will be positive, as the (relatively) cooler body equalizes with the warmer environment. External factors can have a significant influence.

The term was first used by Bennet Dowler in 1849.^[1] The first published measurements of the intervals of temperature after death were done by John Davy in 1839.^[2]^[3]

Applicability

A measured rectal temperature can give some indication of the time of death. Although the heat conduction which leads to body cooling follows an exponential decay curve, it can be approximated as a linear process: 2 °C during the first hour and 1 °C per hour until the body nears ambient temperature.

The Glaister equation^[4]^[5] estimates the hours elapsed since death as a linear function of the rectal temperature:

(36.9^{\circ }C-{\text{rectal temperature in Celsius}})\cdot {\frac {6}{5}}

or

{\frac {98.4\,^{\circ }{\rm {F}}-{\text{rectal temperature in Fahrenheit}}}{1.5}}

Variability

Generally, temperature change is considered an inaccurate means of determining time of death, as the rate of change is affected by several key factors, including:^[6]

Stability or fluctuation of the ambient temperature.
The thickness (i.e. thermal insulation value) and body coverage of clothing or similar materials.
The thermal conductivity of the surface on which a body lies.
Diseases or drugs which increase body temperature and thereby raise the starting temperature of the corpse at the time of death
The existence of a "temperature plateau",^[7] a highly variable length of time in which the body does not cool.

References

^ Riess, Karlem. "The Rebel Physiologist". Journal of the History of Medicine and Allied Sciences. JSTOR 24620836.
^ Davy, John (1839). Researches: Physiological and Anatomical. Smith, Elder and Company. p. 228.
^ Madea, Burkhard (2015). Estimation of the Time Since Death, Third Edition. CRC Press.
^ Forensic Medicine Archives Project University of Glasgow Archived 5 June 2004 at the Wayback Machine
^ Guharaj, P. V. (2003). "Cooling of the body (algor mortis)". Forensic Medicine (2nd ed.). Hyderabad: Longman Orient. pp. 61–62.
^ "Changes to a Body after Death". Archived from the original on 8 September 2018. Retrieved 5 May 2013.
^ Kaliszan, M. (20 May 2005). "Verification of the exponential model of body temperature decrease after death in pigs". Experimental Physiology. 90 (5): 727–738. doi:10.1113/expphysiol.2005.030551. PMID 15944204. S2CID 22096083.