Why is water making noise just before it starts boiling?
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The sound you hear in the half minute before the kettle boils is the sound of thousands of tiny bubbles of steam, formed due to contact with the hot bottom of the kettle, collapsing as they rise into the cooler water above. The water around each collapsing bubble claps together at the moment the bubble vanishes.
As the bulk of the water finally approaches the boiling point the bubbles of steam continue to form on the bottom, but as they rise through the almost boiling water they collapse much more gradually, thus each individual clap becomes less intense and the sound softens, which signals to you that the water is almost boiling.
Eventually the bulk of the water approaches the boiling point, the bubbles make it all the way to the surface, and the sound changes from thousands of tiny claps to a more gentle rumbling of the tumbling water.
The sound you hear in the half minute before the kettle boils is the sound of thousands of tiny bubbles of steam, formed due to contact with the hot bottom of the kettle, collapsing as they rise into the cooler water above. The water around each collapsing bubble claps together at the moment the bubble vanishes.
As the bulk of the water finally approaches the boiling point the bubbles of steam continue to form on the bottom, but as they rise through the almost boiling water they collapse much more gradually, thus each individual clap becomes less intense and the sound softens, which signals to you that the water is almost boiling.
Eventually the bulk of the water approaches the boiling point, the bubbles make it all the way to the surface, and the sound changes from thousands of tiny claps to a more gentle rumbling of the tumbling water.
The sound you hear in the half minute before the kettle boils is the sound of thousands of tiny bubbles of steam, formed due to contact with the hot bottom of the kettle, collapsing as they rise into the cooler water above. The water around each collapsing bubble claps together at the moment the bubble vanishes.
As the bulk of the water finally approaches the boiling point the bubbles of steam continue to form on the bottom, but as they rise through the almost boiling water they collapse much more gradually, thus each individual clap becomes less intense and the sound softens, which signals to you that the water is almost boiling.
Eventually the bulk of the water approaches the boiling point, the bubbles make it all the way to the surface, and the sound changes from thousands of tiny claps to a more gentle rumbling of the tumbling water.
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