Baisse de l’humidité atmosphérique / Decrease in atmospheric humidity
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écrit par Wladimir T.

chef de course et instructeur au Club Alpin Suisse

Le 23 février 2013

Baisse de l’humidité atmosphérique

La quantité de vapeur d’eau contenue dans l’air diminue avec l’altitude.

A 4000 mètres, la tension de vapeur d’eau ne représente plus que le quart de sa valeur au niveau de la mer. Si on ajoute à cela que le volume d’eau contenu dans l’air est plus faible aux températures basses qu’aux températures élevées, il devient manifeste que l’air qui entoure le montagnard est sec.

Cet air sec augmente la déshydratation contre laquelle l’organisme n’a aucune protection. Cet air sec et froid est aussi à l’origine de l’irritation des voies respiratoires et des maux de gorge.

La déshydratation a une conséquence directe sur la performance physique.

Une perte d’eau de 2 % du poids du corps (soit un litre et demi pour 80 kilos) diminue la performance de 20 % !

Decrease in atmospheric humidity

The amount of water vapour in the air decreases with altitude.

At 4000 metres, water vapour pressure is only a quarter of its value at sea level. If we add to this the fact that the volume of water contained in the air is lower at low temperatures than at high temperatures, it becomes clear that the air surrounding the mountain dweller is dry.

This dry air increases dehydration, against which the body has no protection. This dry, cold air also causes irritation of the respiratory tract and sore throats.

Dehydration has a direct impact on physical performance.

A water loss of 2% of body weight (i.e. one and a half litres for 80 kilos) reduces performance by 20%!

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