Thermal comfort

Thermal comfort is the condition of mind that expresses subjective satisfaction with the thermal environment. The human body can be viewed as a heat engine where food is the input energy. The human body will release excess heat into the environment, so the body can continue to operate.

The heat transfer is proportional to temperature difference.
In cold environments, more heat is released than the body generates, and in hot environments, the body cannot release enough heat.
Both the hot and cold scenarios lead to discomfort.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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