Why must you never blow your Bunsen out like you would blow out a candle?

Blowing out a Bunsen burner like a candle can be dangerous because Bunsen burners use gas as fuel, which can continue to flow after the flame is extinguished. If you blow out a Bunsen burner, the gas may still be present and could ignite, causing a fire or explosion. It is safer to turn off the gas supply at the source or use the built-in flame adjuster to extinguish the flame on a Bunsen burner.