What do you think causes a flashback from a hydrogen torch?
I constructed a hydrogen generator, and I made up a torch to burn off the gas. It will hold its flame well and good most of the time, however there are instances when it will backflash all the way back into the bubbler, forcing about an once of water back into the generater cell. Anyone know why?
Probably in those instances some air was mixed with the H2. When you get the "right" mixture (close to an explosive mixture, say), combustion doesn't require mixing with external air, so the flame can propagate backward against the flow.
Ideally before lighting the torch you should let the generator run until you're sure all the air has been swept out.
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