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Energy is measured in joules, and the amount of material is measured in moles.
en.wikipedia.org The commonly known unit of power, the watt, is equivalent to one joule per second.
en.wikipedia.org The energy required for defibrillation ranged from 240 to 720 joules.
en.wikipedia.org They can have energies as high as tens of joules per neutron.
en.wikipedia.org One gray is the absorption of one joule of radiation energy by one kilogram of matter.
en.wikipedia.org