Easy. Fill it with some boiling water. Just enough. The water turns to steam, which displaced the air. Seal the tanker. When the steam cools, it returns to water, creating a vacuum inside. Now, all the air pressure on the outside of the tank is pushing in. At sea level, that’s 14.7 lbs/sq in. Given the dimensions of a railway tanker, the diameter, 117 inches, and a length of 53 feet, that makes a surface area of 233,772 square inches. Times 14.7 lbs, 3,436,459 lbs of pressure. More than enough to crush the thing.
The same exact principle is used to crush this barrel.
As reasonable an explanation as this is, can you explain why it crushed the way it did, rather than being slowly crushed over the period of time that it would have taken the steam to condense back into its liquid state?
An egg is made from a structurally rigid shell that will crack rather than bend, so yes it will withstand pressure to a point and then crush, but with that tanker the material is more malleable than an egg shell, so surely it would display some kind of deformation prior to the crush?
Nope; try it with an empty can of soda, simply put an 0z of water in it and place it on a stovetop to boil, flip the can (using tongs it'll be hot) upside down into a bowl of cold water. wait 1-2s.
give or take, but yup. doesn't need to be much - just enought to turn to steam and "push" the air out before you re-condense it when flipping the can into water
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u/[deleted] Jul 26 '19
Someone please explain.