2nd October 2019

howstuffworks
14

Can you breathe in pure oxygen?

We breathe air that is 21 percent oxygen, and we require oxygen to live. So you might think that breathing 100 percent oxygen would be good for us -- but actually it can be harmful. So, the short answer is, pure oxygen is generally bad, and sometimes toxic. To understand why, you need to go into some detail …

Can you breathe in liquid nitrogen?

It is no more or less dangerous than the gas itself. In the case of nitrogen, oxygen, helium, neon, argon, sulfur hexaflouride, methane etc. you can put your nose right up to the liquid's surface and take a really deep breath, no harm will come to you unless you are stupid enough to breathe it for an extended period.
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