Final answer:
The difference in the estimated time of death and the actual time of death can be attributed to postmortem cooling, which causes the body's temperature to decrease after death.
Step-by-step explanation:
The difference in the estimated time since death and the actual time of death could be accounted for by the phenomenon known as postmortem cooling. After death, the body's temperature will start to decrease, approaching the ambient air temperature. In this case, the man's body temperature was determined to be 69.1°F, which is lower than the ambient air temperature of 80°F. The rate at which the body cools depends on various factors such as body mass, clothing, and environmental conditions.
To further support this claim, research shows that the rate of heat loss from a corpse is influenced by the body's surface area, clothing, and initial body temperature. The body loses heat through conduction, convection, radiation, and evaporation. All these factors contribute to the gradual decrease in body temperature after death, resulting in a lower temperature than the estimated time since death.
In conclusion, the difference between the estimated time since death and the actual time of death can be attributed to postmortem cooling, which causes the body's temperature to decrease over time.