- The metric unit used to measure heat, work, and energy. One joule is the amount of work done or energy expended by a force of 1 newton acting through a distance of 1 meter.
- The SI unit of work or energy. It defined as the work accomplished by a force of one newton in moving an object one meter in the direction said force is applied. One joule equals 107 ergs, approximately 0.23885 calories. Its symbol is J.
- The scientific unit of energy, too small to be of use in nutrition. Hence the kilojoule equal to one thousand joules is used.
- noun the SI unit of measurement of work or energy. 4.184 joules equals one calorie.