Soon the station has breathable oxygen and both Michael and Kumiko declare that "KL-5 is ready for passengers."

Water can easily be used to generate breathable oxygen.

Addition of breathable oxygen to the atmosphere.

Photosynthetic oxygen evolution is the fundamental process by which breathable oxygen is generated in earth's biosphere.

Human exploration of regions that lack breathable oxygen, such as the deep sea or outer space, requires means of reliably generating oxygen apart from earth's atmosphere.

Not only can water provide for colonists' drinking needs, it also can be broken down to provide breathable oxygen.

The molecular hydrogen will combine with oxygen, generating a flooding rainfall and reduced breathable oxygen.

The shallow breathlessness of her own voice told Uhura how near they were getting to the limit of breathable oxygen.

With rebreathers to recirculate exhaust carbon dioxide back into breathable oxygen, we could survive outside comfortably without a vacuum suit.

And you can save on minting more coins / notes by trading breathable oxygen instead!