Talk:Firebending/@comment-201.143.125.182-20120314083954/@comment-3390396-20120314084519

Taken from the article: Firebenders can control the intensity of their firebending, reflected in the color of the flames. These blue flames are more efficient than the standard yellow and orange flames produced by lesser forms of firebending, channeling more energy into the attack and likely traveling further without dissipating.

Only Azula has demonstrated blue firebending. While not to be confused with lightning, blue fire also seems to possess more physical force and produces a combustive effect more intense than that of normal fire, likely due to the fact that it superheats the air around it as it strikes (the same process that creates thunder)

Azula might have not learnt to control the density when she was a child.