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Sweating
Humans ability to control their body heat is determined by the temperature and humidity of the air around them. Our internal body temperature is nearly constant at 37 degrees Celsius (98.6 degrees Fahrenheit), while our skin is colder to allow heat to escape from the inner body. However, if the wet-bulb temperature - a combination of air temperature and humidity - rises above 35°C, the body would be unable to cool itself, eventually resulting in death. Our bodies cannot cool off by evaporating sweat if it is too humid, which is why humidity is critical when considering livability in a hot place, said Yi Zhang, a Princeton University researcher who led the new report, which was published in Nature Geoscience. Extremely high body core temperatures can be fatal.