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when it is changing into gas... bubbles. It is boiling when bubbles begin breaking the surface. the water o nthe bottom is being heated it mixes when it rises because of convection currents. after the water is almost 100 C the water that gets hot enough evaporates and comes out as water vapor. The bubbles are full of steam which gets released when the bubble hits the surface.

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16y ago
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13y ago

There will be bubbles forming at the bottom of the water area that will float to the top. Water boils at 100 degrees celsius/273 degrees kelvin/212 degrees Fahrenheit.

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14y ago

It starts to simmer, and then it bubles-it looks a little like a minni hot tub!

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10y ago

Boiled water is usually hot and bubbly. Unboiled water is room temperature and flat.

Don't know if that was what you were looking for.....

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Q: How can you tell if water is boiling?
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