A unit of → energy in the → International System of Units equal to the → work performed by one → newton over a distance of 1 → meter. 1 J is equivalent to 107 ergs = 1 Watt second = 2.78 × 10-7 kWh = 0.2389 calories = 6.24 × 1018 eV.
In honor of the English physicist James Prescott Joule (1818-1889), who established that the various forms of energy (mechanical, electrical, and heat) are basically the same and can be changed, one into another.
Joule is in Pers. pronounced as žul, loaned from the Fr. rendering of the E. name.
Fr.: effet Joule
pâyâ-ye Joule (#)
Fr.: constante de Joule
The proportional relationship of mechanical energy to thermal energy, equal to 4.184 joules per calorie. Also called mechanical equivalent of heat.
Fr.: effet Joule-Thomson
The change in the temperature of a gas in the → throttling process.