Question: how many joules of energy are in a litre of full cream milk?
Answer: We normally rate the energy of food in calories (actually kilo calories) which is the amount of heat energy required to raise the temperature of 1 kilogram of water 1 Deg Celsius. one litre of whole milk has approximately 680 calories. 1 calorie = 4184 joules. Therefore 680*4184 = 2.85 million joules.