What’s That White Vapor/Smoke/Fog/Mist On Planes That Blows Into The Cabin?

I remember the first time I ever saw that white vapor coming down from the vents above me – you know the one I’m talking about, right? – I had no idea of what it was and it scared the crap out of me – I figured the plane was on fire and why wasn’t anyone doing anything about it?

(Note: yes, I know the video is upside down. My phone is doing weird stuff and capturing photos and video backwards. I uploaded it to YouTube without editing it because I thought YT had a video editor onboard. But it turns out they ended that about a year ago. Go figure. But really…it’s 6 seconds and it’s vapor. You get the gist, even if it is upside down. It’s just not worth pulling out the iMovie software for…)

Have you ever wondered what it is? Why it is? I did. So I went and found out…

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