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Catch fire? 1 bar of oxygen is on the lower end of toxicity, with the only health effects taking hours to manifest. Fires that already exist will burn faster but there's no direct physical danger.

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http://www.hse.gov.uk/pubns/hse8.pdf In pure oxygen some material will start combustion autonomously. But even worst, every possible cause of fire (simple friction, sparkles, etc...) that normally are not an issue, became a deadly hazard. But my point was, no, the air we breath normally is not 100% oxygen, fortunately...

My father was navigator in B-17s. They flew at 30,000 feet, and needed to wear oxygen masks. He told me that the funny thing with that was the chain smokers who couldn't last 8 hours between smokes. A cigarette wouldn't stay lit at 30,000 feet. So the smoker would take a breath from the mask, blow on the cigarette causing it to burn like a torch, take a quick puff, then take another quick breath from the mask, blow on the sputtering cigarette to reignite it, all in an endless loop.

>In pure oxygen some material will start combustion autonomously.

What materials? That guide doesn't list any. Acetylene ignites, but that's generally what you want anyway, right?

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