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Originally Posted by The Lone Ranger
As an aside, pure hydrogen burns so cleanly (that is, with little or no smoke), that its flames are usually invisible.
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I was under the impression its color was ultraviolet.
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I've sometimes heard people claim that fire is a plasma -- an ionized gas. That isn't true. A normal fire does not burn hot-enough to ionize the gases involved.
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good to know. Explains why I couldn't measure the resistance of a candle flame.