4.184 × 106 J – energy released by explosion of onekilogram of TNT
106 J = 239 kcal – the nutritional value of a snack (e.g. a Mars bar) is around that value, typical servings of staple food such as 150 g of rice or 200 g of wheatbread as well.
1500 kcal = 6.3 × 106 is an often recommended value for the nutritional energy a woman not doing heavy labour needs per day (2000 kcal = 8.4 × 106 for men).
* 2,147,616 J – the power output of one man working one day (8 hours; calculation based on the conventional value for human power output used in agriculture, which is 0.1 horsepower)
The joule (symbol: J) is the SI unit of energy, which is defined as the potential to do work.
As a rough guide, 1joule is the absolute minimum amount of energy required to lift a one kilogram object up by a height of 10 centimetres on the surface of Earth.
Its value was found by James Prescott Joule in experiments that showed the mechanical energy Joule's equivalent, and represented by the symbol J. The term was first introduced by Dr. Mayer of Heilbronn.
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