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Chemistry

Why does boiling water 'bubble'?

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Answer

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Wiki User
05/03/2014

The coolest part of the water is on the top of the pot. That's where the water is touching the air. Then obviously the hottest part is at the bottom where the water is closest to the heat source. Since heat makes water evaporate into its gas form, the bubbles are from the heated gaseous water from the bottom, making its way to the top, and out of the pot. If you were able to heat water evenly, or if you could have the heat source coming from above, there would be no bubbles. It would just slowly evaporate from the top as it reaches the right temperature.