system
Given the following post, respond as if you're commenting on Reddit:
human
[A:TLA] Why is Azula's fire blue?

As a child, it was red/yellow, but it becomes blue? Also, she was very powerful, but Ozai and Iroh both seem to be at her level, but they stay at that color.
gpt
She does not ever hold back and all her attacks are pinpoint concentrated, the hottest fire we have seen is blue.


Blue fire is hotter because it is losing less energy to visible light than red fire. Fire you cannot see with your eyes would be the hottest.