# NASA launches Perseverance rover

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CALICO
This example is hilariously odd, and got me wondering how much oxygen production is needed to keep an adult human alive: 12–20 breaths/min 500ml breath volume (up to 6L total capacity! neat!)...

MOXIE will try to demonstrate that is possible on the surface of the red planet. But the amount of oxygen it could produce — less than ounce per hour — is tiny.

“We’re only making about enough oxygen to keep a small dog alive,” said Michael Hecht

This example is hilariously odd, and got me wondering how much oxygen production is needed to keep an adult human alive:

• 12–20 breaths/min
• 500ml breath volume (up to 6L total capacity! neat!)
• atmosphere 20.95% oxygen by volume
• @1atm, 500ml of breath = 104.8ml O2
• @1atm, 104.8ml O2 = 0.1372g

That's 1.6464–2.744g O2/min (0.05808–0.096792oz O2/min), and 98.784–164.64g O2/hour (3.4845–5.808oz O2/hour).

I feel like I remember hearing somewhere that only 25% of the oxygen we breath is used in a single breath. If that's true that pushes our range to 0.871125–1.452oz O2/hour, however I imagine that might be rather uncomfortable or distressing.

Check my math, I didn't.