But doesn't that depend on how large is the pot and how much energy you're putting into boiling it? Not to mention that you also need to know the environment in

But doesn't that depend on how large is the pot and how much energy you're putting into boiling it? Not to mention that you also need to know the environment in the which you're trying to boil the water. If you're trying to boil the water in the middle of arctic winter, can you predict that the pot will get to over 100C if you're using just a small camping stove? :)