OK, this is a question I've wondered about for a long time, which surfaced when I was thinking about the rosebud torch question. I had a couple of years of college chemistry back in the '80s, but that's about it. Here 'tis:
Does a propane/oxygen torch burn any hotter than a propane/air torch? If so, why? It's the propane that provides the energy, and there should be sufficient oxygen in the air of a prop/air torch to fully burn the propane. If you use the same amount of propane but mix it with a smaller volume of oxygen, why would it put out more heat?