More physics

If you liked the sublimation of hot oil shown by William Shatner in my other posted video, you might be a physics nerd. Here's a video (in real time!!) of what happens if a railroad sealed container isn't vented properly.  It was emptied out and the hot gas remained inside, displacing volume.  The gas cooled, reducing the volume inside.

Safety dictates that the workers would have to keep a vent open after emptying it to avoid this problem.  This was a safety demonstration to show the public the power of our atmospheric pressure!

Note that air pressure works differently from gravity.  If you forgot in what ways, you can watch this.  Note that not everyone has a great control over gravity.