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The Collaborative International Dictionary of English v.0.48 (gcide)

Erg \Erg\, n. [Gr. ? work.] (Physics)
The unit of work or energy in the C. G. S. system, being the
amount of work done by a dyne working through a distance of
one centimeter; the amount of energy expended in moving a
body one centimeter against a force of one dyne (981 dynes
exert the same force as a one gram mass in the earth's
gravitational field). One foot pound is equal to 13,560,000
ergs. The absolute Joule is equivalent to 10^{7} ergs, which
are equivalent to 0.2389 gram-calories at 15[deg] C. See also
{mechanical equivalent of heat} under {equivalent}.
[1913 Webster PJC]

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