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VIDEO. Extreme temperatures, humidity... how humans risk dying of heat

2022-05-17T17:45:40.145Z

India and Pakistan have been experiencing a dramatic heat wave since March and the temperature threshold was reached last week.



In India and Pakistan, "the temperature has reached the fatal threshold for humans", many newspapers were alarmed last week, while the two countries are in the grip of an extreme heat wave.

But can we really die of heat?

“Yes”, replies straight away Thibault Laconde, specialist in climate issues and founder of Callendar.

Past a certain temperature, our body succumbs.

To get there, “our temperature regulation mechanisms must no longer work,” explains the engineer.

To maintain a good temperature, around 37°C, our body uses two methods: the first mechanism is by conduction, in contact with the air and the second is by perspiration.

By evaporating, it will allow Man to cool off.

In a dry environment, the body can withstand high temperatures.

“45, 50°C”, specifies Thibault Laconde.

But in a humid environment, our resistance is much lower.

Because if the air is saturated with humidity, perspiration does not evaporate.

And the body does not cool off.

“With a relative humidity rate of 100%, the limit is around 35°C,” concludes Thibault Laconde.

Read alsoHeat wave: "We will have to sacrifice certain crops" ... the consequences of the heat stroke for the next few days

With climate change, this threshold could be reached much more often, experts warn.

Among the most exposed regions: South Asia and the Middle East.

But for Thibault, the issue is not necessarily at the level of this fatal temperature threshold.

"The heat already kills well before reaching this stage," he recalls, referring to the 2003 heat wave which killed just over 20,000 people in France.

His video explanations.

Source: leparis

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