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Michael Daly

wrote:

Actually it is a distinction without a difference. If you fill a
vessel with combustible gas and feed the oxygen in through a burner it
looks like the oxygen is burnng.

If you fill a vessel with only H2 and O2 and ignite it, the product is water and
heat. If you fill a vessel with H2 and air and ignite it, the H2 and O2 will
combine to form water and heat. The heat of combustion will then cause the N2
in the air to combine with the O2 to form oxides of nitrogen. That is a
significant difference.

Mike