
Boil
Visible Bubbles
Look for active, visible bubbles forming in the liquid — a key sign it's boiling.

You'll see bubbles rising when the water reaches a boil.
Continuous Heat
A liquid needs to maintain high heat to keep boiling — not just to start.

Keep the burner on high to maintain the water's boil.
Compare with
BlazeBubbleCookHeatScaldSeetheSimmerSteam
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