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For a naked body, the figure is 40-50% (dependent on source) heat-loss through the head. We have a very complex regulation of brain temperature, and large amounts blood is led to the skalp to avoid overheating. When exposed to extreme cold, our blood vesels in the skin and extremeties shrinks, so we keep our core temperature pretty constant. This happens very slowly in the neck and head areas. They stay at almost the same temperature for very long, no matter how cold the surroundings get.
US Army Survival Manual (FM 21-76) mentions some "Basic Principles of Cold Weather Survival" on page 148:
"For example, always keep your head covered. You can lose 40 to 45 percent of body heat from an unprotected head and even more from the unprotected neck, wrist, and ankles. These areas of the body are good radiators of heat and have very little insulating fat. The brain is very susceptible to cold and can stand the least amount of cooling. Because there is much blood circulation in the head, most of which is on the surface, you can lose heat quickly if you do not cover your head."
Not quite. Celsius' scale was reversed: Water froze at 100 and boiled at 0. Martin Strömer reversed Celsius' scale a few years after Celsius introduced it around 1740. Strömer's scale is actually the one, we use today as the "Celsius scale"
US Army Survival Manual (FM 21-76) mentions some "Basic Principles of Cold Weather Survival" on page 148:
"For example, always keep your head covered. You can lose 40 to 45 percent of body heat from an unprotected head and even more from the unprotected neck, wrist, and ankles. These areas of the body are good radiators of heat and have very little insulating fat. The brain is very susceptible to cold and can stand the least amount of cooling. Because there is much blood circulation in the head, most of which is on the surface, you can lose heat quickly if you do not cover your head."
The correct spelling is Celsius (after the Swedish deviser of the scale)
Not quite. Celsius' scale was reversed: Water froze at 100 and boiled at 0. Martin Strömer reversed Celsius' scale a few years after Celsius introduced it around 1740. Strömer's scale is actually the one, we use today as the "Celsius scale"
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