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# Erg

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### Erg

An erg (short for ergon, a Greek word meaning "work/task"[1]) is a unit of energy and mechanical work equal to 10−7 joules. It originated in the centimetre–gram–second (CGS) system of units, symbol "erg". It is not an SI unit.

An erg is the amount of work done by a force of one dyne exerted for a distance of one centimeter. In the CGS base units, it is equal to one gram centimeter-squared per second-squared (g·cm2/s2). It is thus equal to 10−7 joules or 100 nanojoules (nJ) in SI units. An erg is approximately the amount of work done (or energy consumed) by one common house fly performing one "push up", the leg-bending dip that brings its mouth to the surface on which it stands and back up.[2]

1 erg = 10−7 J = 100 nJ

1 erg = 10−10sn·m = 100 psn·m = 100 picosthène-metres

1 erg = 624.15 GeV = 6.2415×1011 eV

1 erg = 1 dyne cm = 1 g·cm2/s2

## History

In 1864, Rudolf Clausius proposed the Greek word (ἐργον) ergon for the unit of energy, work and heat.[3][4] In 1873, a committee of the British Association for the Advancement of Science, including British physicists James Clerk Maxwell and William Thomson defined the C.G.S. System of Units, and recommended the name erg or ergon for the C.G.S. unit of energy.[5]

## References

1. ^ Oxford English Dictionary
2. ^ Filippenko, Alex, Understanding the Universe (of The Great Courses, on DVD), Lecture 44, time 24:30, The Teaching Company, Chantilly, VA, USA, 2007
3. ^
4. ^ Howard, Irmgard K. (2001). "S is for Entropy. U is for Energy. What Was Clausius Thinking?". Journal of Chemical Education 78 (4): 505.
5. ^
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