Algor mortis (Latin: algor—coldness; mortis—of death), the second 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 acclimates to the warmer environment. External factors can have a significant influence.
|Stages of death|
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.
As decomposition occurs the internal body temperature tends to rise again.
- Stability or fluctuation of the ambient temperature.
- The level and thickness 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", a highly variable length of time in which the body does not cool.
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