system
Given the following post, respond as if you're commenting on Reddit:
human
What is the sound made by fires?

Where does the sound of fire come from exactly?
gpt
You're probably thinking of the crackling sounds that comes from burning wood. Wood has pockets of moisture in it, and fire boils that moisture and increases the internal pressure in the wood, causing it to crack. The cracking wood is where the sound comes from.

A fire like a bunsen burner doesn't make any sound other than the gas coming out of the nozzle.