a mechanical representation of energy

a unit which measures energy, in the same way that kilometres measure distance

The SI unit for a measure of the energy value, for example in food and physical activity. 1 kilojoule (kJ) = 0.238 kilocalories (kcal)

the unit in which scientists measure energy (A calorie is equal to 4.2 kilojoules.)

a metric measurement referring to the amount of energy required when a force of one newton (N) moves one kilogram of weight one meter distance

(kJ)  It is equal to 1 000 J; 1 kcal = 4.184 kJ. See joule.

when carbohydrates, protein and fats are metabolised by the body, they produce energy which is measured in units known as Kilocalories (kcal) or the metric term Kilojoule (kJ). One kilocalorie is the amount of energy required to raise the temperature of one kilogram of water by one degree centigrade (1 kJ =4.2 kcal).

(Abbreviated kj.) A unit of energy in the International System of Units (SI). One kilojoule is equal to 103 joules, or to 1010 ergs, or to 238.9 calories.