The search for the highest temperature supported by the human body began in the 18th century, by the English physician Charles Blagden, and by an unusual way: Mr. Blagen decided to enter a room heated to 105°C, having managed to remain in the room for 15 minutes. More recent and less dangerous tests were able to discover the exact maximum temperature we can withstand: 127ºC, for 20 minutes.
In fact, sweat is largely responsible for withstanding high temperatures. In this sense, when the air is dry, we can withstand higher temperatures, since sweat steals heat from the body and evaporates. When the air is humid, any temperature above 40ºC can become unbearable, as it cannot evaporate and soften the body's temperature.
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Would you like to reference this text in a school or academic work? Look:
DANTAS, James. "What is the highest temperature the body can withstand?"; Brazil School. Available in: https://brasilescola.uol.com.br/curiosidades/qual-maior-temperatura-que-corpo-pode-aguentar.htm. Accessed on June 27, 2021.