Why does one start sweating at 25 degrees (Celsius)/77(F) even though the body temperature is much higher?
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Sweating is basically a more efficient cooling mechanism for your body. You produce heat all the time (especially when you’re moving –> sports), however you must not overheat. If outside temperature gets closer to the body temperature, surrounding air cannot take up enough of your produced heat to maintain your body-temperature. So you start to sweat, as the fluid takes a lot of heat from your skin when evaporating (the exact amount is called “heat of evaporation” or “enthalpy of vaporization”)
Because the difference in temperature is much lower, and hotter temperature areas tend to have lower winds
When it’s really cold out, you lose a lot of heat, because heat likes to balance out and move to cold places. The bigger the difference between your body heat and the temperature outside, the faster the heat transfer.
When the heat outside is closer to your body temperature, that transfer of energy is much slower
You also have to consider wind. Wind blows air across the surface of your skin. As the air hits your skin, it heats up, thus drawing heat energy from your body. The higher the wind, the higher the number of particles bouncing off your skin, thus the quicker the heat loss. If you’re in a hot place, it tends to have less wind, so you can’t lose any body heat through this method.
the body produces heat and it needs the environment cooler than itself to prevent it from making too much heat.
if the environment is 95 degrees, you’re still making a lot of heat, so your body will go above the temperature of the air because there’s nothing to cool it down.
Basically, you starts sweating once your body can’t get rid of enough heat through exposure. The higher temperature your surrounding is, the slower heat transferral is through exposure.
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