how does the space station make oxygen

The International Space Station (ISS) generates oxygen through a couple of key processes, primarily using a method called electrolysis. Here’s how it works:

1. Electrolysis of Water

• Water Supply: The ISS has a supply of water (H₂O), which can be delivered by resupply missions or produced on board through various processes.
• Electrolysis Process: Electrolysis involves passing an electric current through water, which splits the water molecules into hydrogen (H₂) and oxygen (O₂) gases: 2H2O→2H2+O22H₂O \rightarrow 2H₂ + O₂2H2​O→2H2​+O2​
• Oxygen Collection: The oxygen gas produced during electrolysis is collected and stored in tanks for use by the crew.

2. Oxygen Tanks

• In addition to producing oxygen through electrolysis, the ISS also carries oxygen tanks filled with compressed oxygen. These tanks can be used as a backup or supplement to the electrolysis system.

3. Carbon Dioxide Removal

• The ISS is equipped with systems to remove carbon dioxide (CO₂) exhaled by the crew. This is typically achieved using chemical scrubbers that absorb CO₂ from the cabin air, ensuring a safe and breathable environment.

4. Regeneration of Air

• The combination of generating oxygen and removing carbon dioxide helps maintain a stable atmosphere for the astronauts aboard the ISS.

These systems are crucial for the long-term sustainability of human life in space, particularly for extended missions.