It gets even better: take that 1kg of water at 0°C, add 100 kilocalories of heat energy, and it's now 100°C and just about to boil. (That's assuming you're at

It gets even better: take that 1kg of water at 0°C, add 100 kilocalories of heat energy, and it's now 100°C and just about to boil. (That's assuming you're at sea level, as another commenter noted - if you're at 5,000 feet, the boiling point of water is something like 95°C.)