Pourquoi doit-on laisser les vitres de voiture ouvertes dans le tunnel sous la Manche ? - Question Réponse Société & Vie quotidienne - Pourquois.com.

Pourquoi doit-on laisser les vitres de voiture ouvertes dans le tunnel sous la Manche ?

La différence de pression atmosphérique soudaine lors de l'entrée du train dans le tunnel pourrait faire exploser une vitre !

Ouvrir, même très peu, une fenêtre permet d'égaliser rapidement la pression entre l'intérieur et l'extérieur de la voiture.
On évite alors la pression. et le bris de vitres !
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Vos commentaires sur ce Pourquoi

Mjy a commenté cette question :
Mormalement il y a des clapets dans les voitures pour decompresser l habitacle

Poli du30 a commenté cette question :
C est vrai,
:-)


Aniiomo a commenté cette question :
Je suis d accord avec vous une copine a moi y est allée et elle a eue besoin d 'ouvrir ses clapets de voiture

Mouilleron a commenté cette question :
Je dirais que cette petite poche a été conçue pour y mettre son briquet de grande valeur.

Nacre a commenté cette question :
Les Pourquois avec un s ? En principe, les adverbes sont invariables. Là je suppose que c'est parce que ce terme est utilisé en nom commun. Mais tout de même, ça m'interpelle ! Merci.

Dany44360 a commenté cette question :
Bien sûr. Il s'agit là d'un adverbe substantivé.

Lucas jacques a commenté cette question :
cela est logique bravo e prevenir car tout le monde n est pas au courant

Screwunscrew a commenté cette question :
Le tunnel étant par définition ouvert aux deux extrémités, je ne vois pas pourquoi la pression y serait différente de celle de l'extérieur, même s'il y a des ventilateurs puissants à l'intérieur pour en chasser la pollution. La pression de la masse d'eau qui se trouve au dessus n'interfère évidemment pas.

BuckDanny91 a commenté cette question :
@Screwunscrew : tu descends, la pression monte, tout simplement. Par contre c'est vrai que ça me parait étrange qu'une voiture soit à ce point étanche.

Screwunscrew a commenté cette question :
Buckdanny91 votre commentaire est tout à fait exact dans l'eau où la pression augmente de 1 atmosphère tous les 10 mètres, ou encore en avion à haute altitude par rapport à la pression au sol mais pas dans un tunnel situé à quelques centaines de mètres sous terre. La vraie raison est que l'on doit laisser une vitre ouverte pour entendre éventuellement les annonces en cas d'urgence !

Adrien a commenté cette question :
La pression augmente tout simplement à cause du volume représenté par la carcasse du train en mouvement qui comprime rapidement le même volume d'air à l'avant et décompresse aussi rapidement à l'arrière du train. Il faut réfléchir en section et non pas sur la longueur du tunnel ou du train. . .

Georges a commenté cette question :
Je n'ai jamais remarqué de changement tant soit peu perceptible à l'entrée du tunnel. Pour cause: pour la raison ci-dessous le wagon est relativement isolé de l'extérieur.

Le dispositif de lutte contre les incendies isole un wagon signalant un feu et le remplit en cas de besoin d'un gaz inerte (Halon CBrF3). Les fenêtres des voitures doivent être laissées ouvertes pour permettre au gaz d'entrer dans l'habitacle et d'y éteindre le cas échéant un foyer.

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