El ergio es la unidad de medida de energía en el sistema de unidades CGS (centímetro-gramo-segundo), su símbolo es erg. Se trata de una unidad utilizada principalmente en Estados Unidos y en algunos campos de ingeniería. Sin embargo, se considera anticuada, en el sentido que las medidas usadas en décadas recientes incluyendo el SI están orientadas a sistemas MKS (metro-kilogramo-segundo). La unidad de energía usada en el SI es el julio. \n* 1 ergio = 1 x 10-7 julios \n* 1 ergio = 2.389 x 10-8 cal \n* 1 ergio = 624,15 GeV = 6,2415 × 1011 eV \n* 1 ergio = 1 dyn cm = 1 g.cm2.s-2

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The erg is a unit of energy and work equal to 10−7 joules. It originated in the centimetre–gram–second (CGS) system of units. It has the symbol erg. The erg is not an SI unit. Its name is derived from ergon (’έργον) a Greek word meaning work or task. 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. 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

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