Does wiping away your sweat actually help you cool down?
In short: When you're drenched in heat, your instinct is to wipe the moisture away. This video explores the physics of evaporation to determine if removing sweat helps your body regulate temperature or if it's better to let it sit.
The cooling effect of sweat relies on evaporation. Under standard conditions—25°C with 50% humidity and a slight breeze—a human body surface area of 1.5 to 2 m² can evaporate about 0.35 kg of water per hour. This equates to roughly 0.25 to 0.35 mm of sweat covering the entire body every hour, or about 6 micrometers per minute.
The effectiveness of this cooling depends on the environment. In higher humidity (60-70%), the evaporation rate drops to about 0.37-0.5 L of water per hour. Furthermore, the video notes that if the energy for evaporation comes partially from the surrounding air—potentially 1/3 to 1/2 of the energy—the person is only being cooled down partially.
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- Summary by Intellect · source: Should You Wipe Off Your Sweat?
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