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Aldayne t1_j2czz25 wrote on December 31, 2022 at 9:21 AM

Reply to comment by brownlawn in ELI5: why gas fireplaces have long orange flames while gas stoves have very short blue flames. by brownlawn

A blue flame means the fuel (gas) is combusting fully - complete. Incomplete means not all the gas is being consumed in the reaction with the excess being released into the atmosphere.