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Heat Stress
Page 4 of 6

Complete evaporation of 1 liter of sweat removes 580 kilocalories of heat. That means that a firefighter needs to evaporate about 1 liter (slightly more than 1 quart) of sweat during each hour of work. Maintaining body fluids is essential for sweating. That means you must hydrate before, during, and after work.

Image of a Heat Stress Chart



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