NASA News: Ironing Out the Difficulties of Moving Fluids in Space
Fluid flows downhill – at least it does on Earth. Fluid movement becomes much more complicated in space, and that creates challenges for systems that rely on pumping fluids around for thermal control, engine propellants and other functions.
my 2 cents:
An interesting article about an investigation aboard the ISS on how to move liquids with the power of magnets instead of using pumps with mechanical moving parts...
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Read full article on nasa.gov
It occurs due to less or no gravity in space. I have seen in a video, that fluid floats there.