Energy Units
Energy Units :
The unit of mass for energy is joule, symbol: J. The former unit kilocalorie (kcal) was replaced by joule on adoption of the international system of units in Germany from 1st Jan. 1978. In nuclear physics the energy values are mainly indicated in →electron volt (eV). 1 eV = 1.602•10-19 J. The indication of energy values in kilowatt hours (kWh) is widely used: 1 kWh = 3.6•106 J. Related to the energy content of coal also the coal equivalent is usual in energy supply: 1 tonne coal equivalent is equal to 1 tonne coal with a calorific value of 29.3 billion joule = 7 million kcal
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