Is oxygen flammable?

Okay, I am sure that oxygen isn't flammable but some friends of mine swear that it is so if you could confirm that it isn't and maybe give some proof of why I'd appreciate it. Thanks.
Thomas Sladden (

In combustion, oxygen oxidizes a fuel. But oxygen itself isn't a fuel. Demonstrate to your friends that oxygen itself doesn't burn by asking them to write a combustion equation for oxygen.

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Author: Fred Senese

General Chemistry Online! Is oxygen flammable?

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