5 ms·

Here you go: https://en.wikipedia.org/wiki/Oxygen_toxicity https://en.wikipedia.org/wiki/Oxygen_toxicity

• aflag 4y ago
  Interesting. I always assumed divers had 100% oxygen tanks, but I guess percentage and pressure are different things. But with that in mind, wouldn't a great percent of oxygen just mean there is less of the other gases, but the relative pressure would still be the same as gravity didn't change?
  • _moof 4y ago
    When you're dealing with one constituent of a gas mixture, it's partial pressure that counts, not the pressure of the whole mixture. If the proportion of oxygen in the atmosphere were to increase without a change in overall atmospheric pressure, the partial pressure of oxygen would increase. Another way of saying this is, you would have more oxygen molecules in the same volume of space. The total number of all molecules per unit of volume would be the same, but more of those molecules would be oxygen. More oxygen molecules per unit of volume = higher pressure.