Final answer:
House fires typically reach temperatures between 1000°F and 2000°F, which is insufficient to destroy a skeleton. The critical temperature of CO₂ explains the difference in physical state of CO₂ in a fire extinguisher. Excessive temperatures significantly higher than normal body temperature are lethal to humans.
Step-by-step explanation:
In house fires, unless an accelerant is used, the temperature will typically range from 1000°F to 2000°F (538°C to 1093°C). This range of heat is not sufficient to consume a skeleton, which requires temperatures above 2000°F to be completely destroyed. In the context of a wood stove designed to be efficient and prevent most heat from escaping through the chimney, the temperatures can be better regulated and contained. The flash points that are provided for the context are measures of the temperatures at which various materials ignite, which is different from the temperature necessary to destroy bone.
The critical temperature of carbon dioxide is relevant in understanding how CO₂ behaves under different temperature conditions. On a cool day with temperatures around 18°C (64°F), liquid CO₂ can exist within a fire extinguisher, which is why you may hear it sloshing around. However, at temperatures exceeding the critical temperature of CO₂, which is approximately 31°C (87.8°F), the CO₂ will not liquefy under pressure, explaining why no liquid is heard on a hot day at 35°C (95°F). A significant temperature increase above the human body's normal temperature, such as to 73°C (163°F), would be lethal, just as a 95% heat retention is an unreasonable and harmful assumption for any biological organism.