Need more air in space? Magnets could yank it out of water.

Humans tend to take a lot for granted, even something as simple as a breath of fresh air. It’s easy to forget how much our bodies depend on oxygen—until it becomes an invaluable resource, such as aboard the International Space Station. Although astronauts are typically sent to space with stores of necessary supplies, it’d be too costly to keep sending tanks of breathable air up to the station. Instead the oxygen that astronauts rely on for primary life support is created through a process called electrolysis, wherein electricity is used to split water into hydrogen gas and oxygen gas.

https://www.popsci.com