When you're waiting for a pot of water to heat up on the stove, tiny bubbles are the first sign it's getting ready to boil. As the water gets hotter, the bubbles get bigger, until a rolling boil signals the water has reached 212 degrees Fahrenheit (100 degrees Celsius).
Or does it? Anyone who has boiled water in a microwave will note the lack of bubbles. So, why does boiling water have bubbles, except in a microwave?
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