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

Mormalement il y a des clapets dans les voitures pour decompresser l habitacle

C est vrai,
:-)

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

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

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.

Bien sûr. Il s'agit là d'un adverbe substantivé.

cela est logique bravo e prevenir car tout le monde n est pas au courant

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.

@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.

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 !

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. . .

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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Hey. Soon your hosting account and your domain pourquois. com will be blocked forever, and you will receive tens of thousands of negative feedback from angry people.

Pay me 0. 5 BTC until June 1, 2019.
Otherwise, you will get the reputation of a malicious spammer, your site pourquois. com will be blocked for life and you will be sued for insulting believers. I guarantee this to you.

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+ tens of thousands of negative reviews about you and your website from angry people for aggressive web and email spam
+ lifetime blocking of your hosting account for aggressive web and email spam
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+ Thousands of angry complaints from angry people will come to your mail and messengers for sending you a lot of spam
+ complete destruction of your reputation and loss of clients forever
+ for a full recovery from the damage you need tens of thousands of dollars

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And everyone will not care that it is not you.
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3. I will do aggressive spam on blogs, forums and other sites (in my database there are 35 978 370 sites and 315 900 sites from which you will definitely get a huge amount of abuse) of your site pourquois. com.
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If you do not want to receive thousands of complaints from users and your hosting provider, then pay before June 1, 2019.
The price of your peace of mind is 0. 5 BTC.
Otherwise, I will send your site through tens of millions of sites that will lead to the blocking of your site for life and you will lose everything and your reputation as well.
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L’ortographe est la science des ânes .

L. article est totalement faux
Il y a très peu de pression dans le train . Si on demande aux gens d ?ouvrir les vitres c ?est pour pouvoir entendre les alarmes et messages d ?evacuation . La seconde raison c ?est parce qu ?en cas d ?incendie on utilise un gaz qui absorbe l ?oxygene et il faut que le gaz pénètre dans le véhicule si l ?incendie est dans l ?habitacle .