Ina fizix, enaji a di prapati a abjek we kiah chanzfor tu ada abjek ar kanvoert ina difrah-difrah faam[1]. Di "abiliti a sistim fi pofaam wok" a kaman diskripshan, boti misliidn bikaa enaji no nesiserili avielebl fi du wok[2]. Far instans, ina SI yuunit, enaji meja ina juul, ah wan juul difain "mikianikali", az di enaji chansfor tu wah abjek bai di mikianikal wok fi muuvi a distant a 1 miita gens a fuos a 1 nyuutan. Ousomeba, a nof eda difinishan a enaji, dipen pah di kantex, laka toermal enaji, riediant enaji, ilekchomagnetik, nyuuklier, etc., we di difinishan diraiv we a di muos kanviiniant.

  1. Kittel, Charles; Kroemer, Herbert (1980-01-15) (in en). Thermal Physics. Macmillan. ISBN 9780716710882. https://books.google.com/books?id=c0R79nyOoNMC. 
  2. Benno Maurus Nigg, Brian R. MacIntosh, Joachim Mester (2000). Biomechanics and Biology of Movement. Human Kinetics. p. 12. ISBN 9780736003315. https://books.google.com/books?id=1BG78utt6VUC&pg=PA12&dq=energy+%22capacity+to+perform+work%22#v=onepage&q=energy%20%22capacity%20to%20perform%20work%22&f=false.