a multiple of the joule, which is a unit of energy (work) in the International System of Units; also a unit of energy (work) in the meter-ton-second (mts) system of units (with the specific designation sthene-meter). It is designated by the abbreviation kJ; 1 kJ = 1,000 J = 101.97 kgf · m = 238.85 cal = 0.27778 W · hr = 6.2419 × 10²¹ eV.