Why does water stop boiling when you lower the heat source (but is still more than the boiling temperature)?

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I have observed this while cooking, but if you boil something at high flame and then turn the flame low, the liquid stops boiling. E.g. Water boils at 100C. On high gas, it starts boiling. That means the water temp is now 100C. Then if I lower the flame, the water stops boiling even though the flame temperature is greater than 100C at all times. At high flame, the water has reached 100C, so if I lower the flame the water temp should still remain 100C.

In: Physics

10 Answers

Anonymous 0 Comments

>but is still more than the boiling temperature

That is the key mistake here – the water is no longer at a boiling temperature. Since the temperature of the water is constantly being cooled by the air and even the pot holding it, the lower fire means that the water is now being cooled faster than it is being heated.

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