Why does the tea kettle go quiet before it starts to whistle?
In: Chemistry
As kettle heats, the conditions for boiling exist close to the heat (the bottom) bot not higher. Vapor bubbles form on the hot bottom and collapse almost immediately. You’re hear the collapse (cavitation, as noted elsewhere).
When the water heats sufficiently, the conditions for boiling exist all the way through, the bubbles escape through the surface with very little noise.
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