Why does water make that rustling sound right before it boils?
In: Physics
It’s already boiling when you hear that, it’s just only boiling in a tiny layer at the bottom. What you’re hearing is the formation of a huge number of microscopic bubbles at the bottom of the pan that immediately pop as they outgrow the thin boiling layer. As the water continues to warm up, the boiling layer thickens and the bubbles can grow larger, until they’re eventually large enough to see.
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