Why does an open pot of water swish so much in a car when driving? Do we swish but we’re a “closed pot”?
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This has been well answered, so I’ll add an interesting tidbit about how we transport large amounts of fluid (i.e. oil tankers, etc.).
If you just put the fluid into a big tank it’d act exactly like the container. Such a large amount of fluid sloshing around would build up into some pretty wicked waves crashing against the sides of the container and topple the vehicle.
The solution? We break up the container into lots of smaller containers (imagine adding a 3d noughts and crosses / tic tac toe board to the inside of the container). This means instead of one big wave there’s lots of small waves and, importantly, most of them don’t hit the side wall where the leverage is greatest.
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