Ashish 8 May 2019 (Updated: 14 Apr 2020) The International Space Station (commonly called the ISS) is a manned satellite that orbits our planet at an altitude of more than 200 miles. But from where do they get their oxygen? It turns out they get it by 'splitting' H 2 O with electricity.
How do astronauts get their oxygen? Oxygen is the “O” part of H2O. Life support systems on the ISS provide oxygen, absorb carbon dioxide, and manage vaporous emissions from the astronauts themselves. But, like everything to do with space travel, it's tricky. The oxygen is vented into the breathable cabin air system, known as the Oxygen Generation System, while the explosive hydrogen is vented externally.

Here’s how they do it: an electric current is passed through water molecules to break them down. It's all part of breathing easy in our new home in space. Like I briefly mentioned, they can get oxygen from that same water.
The station’s football-field-sized solar arrays are the power source to electrolyse the water.

Oxygen Ah, the question of the day! It's all part of breathing easy in our new home in space. How Does The ISS Get Breathable Oxygen? Remember your chemistry classes in school?