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This question has plagued me for a while.
What is the difference between breathing oxygen and welding oxygen?

First,I was told that welding O2 had more hydrocarbons contained in
it, BUT isn't the explosion/fire risk the same? How many auto mechanics wash 
and dry there hands before changing a regulator on an
oxy-acetylene torch? The second thing I was told is "there is possibly a 
higher moisture content", to me that doesn't hold up either because oxygen 
(commercial grade) will always come in a steel cylinder, if there is any 
moisture in there it will rust and pretty quickly I might add. So what's the 
deal? Anybody?

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