Originally Posted by
frankstoneline
the "calorie" you see on the back of cereal boxes etc. is usually the KCAL I believe. A calorie is how much fuel is necessary to raise one gram of water one degree celsius, a KCAL is 1000 times that much.
Well, if you want to get more precise it is the amount of energy to raise 1 g of water from 14.5 degrees Celsius to 15.5 degrees Celsius at 1 atmosphere pressure. Or another choice is 1 thermochemical calorie is exactly 4.184 joules. Or the international steam table calorie is 4.1866 joules.
Too many choices. It's 1000 calories.