Question

Why do we see bubbles in the boiling water?
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Answer 1

Explanation:

How come we see bubbles on the bottom of a pan of water, long before the water actually boils? asks a reader.

If you've ever filled a pot with water, then set it on the stove to heat, you've probably noticed them: tiny bubbles, quickly collecting on the bottom of the pan. Oh good, you may think -- the water's begun to boil.

But don't dump that pasta in just yet. When the first bubbles form, the water may still be lukewarm. In fact, these teeny bubbles actually have nothing to do with the bubbles of boiling. Those bubbles are full of hot, vaporized water. The first bottom-dwelling bubbles, however, are full of plain old air.

Answer 2

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