Quick Answer
Body heat loss in water is extremely high. A person can lose up to 25 times more body heat in water than in cold air. This is due to the high conduction of heat from the body to the surrounding water.
Heat Transfer in Water
In water, the primary mechanism of heat loss is conduction. This is because water is a superior heat conductor compared to air. As a result, a person can lose significant amounts of body heat rapidly when submerged in cold water. For example, in water at 50°F (10°C), a person can lose up to 1.2°F (0.67°C) of body heat per minute. This is in contrast to air at the same temperature, where the rate of heat loss is significantly slower.
Hypothermia Prevention and Treatment
To prevent hypothermia when in cold water, it is essential to take immediate action. This includes removing wet clothing, covering the body with a warm blanket or emergency bivvy sack, and providing warm drinks (such as tea or hot chocolate). Additionally, if the person is unconscious or showing signs of hypothermia, it is crucial to call for medical assistance and begin CPR if necessary. When treating hypothermia, it’s also essential to use a warm compress or heating pad to help raise the body temperature. Apply the warm compress to the neck, chest, or groin area.
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