Question

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

Answer 1

Because 100 degrees is the boiling point, the water boils and becomes steam at that point. So the water that was higher than 100 degrees actually became steam, which is why the water in the pot is tops off at 100 degrees.

Answer 2

The heat energy that is added to the water is used to vaporize the water rather than raise its temperature.

Step-by-step explanation:

The boiling point of water is 100 °C, which means that when water reaches this temperature, it will vaporize rather than rise in temperature. Under normal conditions, the temperature of water cannot rise above 100 °C.