In this video: https://youtu.be/IyBRGhXBuGw

The cabin pressure is reduced and subsequently a mist is formed.

What exactly is the cause?

  • $\begingroup$ Consider what happens to the temperature of a gas as pressure is reduced. PV=nRT $\endgroup$ Oct 25 '21 at 21:34
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    $\begingroup$ Note that requests for video comments are not very welcome. It is not critical here, as video is not even needed. But generally, the least you should do is providing the relevant video timestamp. Community readers are not really fans of watching videos to provide answers. $\endgroup$
    – Poutnik
    Oct 25 '21 at 22:11
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    $\begingroup$ Please describe the content of the video and refer to it with creator and title. Links may die as videos get deleted, renamed, set private again, etc., and this question losses all context. Please edit accordingly. In its current state it should probably be closed. $\endgroup$ Oct 25 '21 at 23:33
  • $\begingroup$ See Gay-Lussac's Law. en.m.wikipedia.org/wiki/Gay-Lussac's_law $\endgroup$
    – An Alien
    Oct 26 '21 at 4:12
  • $\begingroup$ I wrote "In this video [..] the cabin pressure is dropped and a mist is formed". How is that not a description? I'm not going to change it for no reason, so just close it, if that makes you happy. $\endgroup$ Oct 26 '21 at 10:36

Reducing pressure causes temperature drop, as part of thermal energy of air is spent on mechanical work during air expansion.

That is why there is cold air at high altitudes. Air cools down by 1 °C when air climbs 100 metres upwards until first condensation.

When temperature drops below the dew point, mist starts forming.


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