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Why does boiling water in a pot on a stove have a temperature of 100°C even if it has been boiling an hour?

Answer 1

The boiling point of pure water doesn't depend from the time from wich has begun to boil. It depends only by the atmosferic pressure and possibly by the concentration of solute dissolved in it. In fact it depends by the energy required to break the hidrogen bonds that connect the individual molecules of water

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Answer 2

Cameron Andrews

The temperature of boiling water remains constant at 100°C because at this temperature, the energy being supplied to the water is used solely to overcome the intermolecular forces holding the water molecules together, causing them to change from liquid to gas phase. Any additional energy supplied beyond this point does not increase the temperature but instead causes the water to undergo a phase change from liquid to gas. This phenomenon is known as the boiling point of water.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.