## JOULE

### Joule

The**joule**, symbol

**J**, is a derived unit of energy, work, or amount of heat in the International System of Units. It is equal to the energy expended in applying a force of one newton through a distance of one metre, or in passing an electric current of one ampere through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule .

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### joule

#### Noun

- In the International System of Units, the derived unit of energy, work and heat; the work required to exert a force of one newton for a distance of one metre. Also equal to the energy of one watt of power for a duration of one second. Symbol: J
*The Greisen–Zatsepin–Kuzmin limit (GZK limit) is a theoretical upper limit on the energy of cosmic rays (high energy charged particles from space) coming from "distant" sources. The limit is 5×10*^{19}eV, or about 8**joules**. The limit is set by slowing-interactions of cosmic ray protons with the microwave background radiation over long distances (~163 million light-years). The limit is at the same order of magnitude as the upper limit for energy at which cosmic rays have experimentally been detected. For example, one ultra-high-energy cosmic ray has been detected which appeared to possess a record 50**joules**(312 million TeV) of energy (about the same as a 60 mph baseball).^{}

*The above text is a snippet from Wiktionary: joule*

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