The title of this article is ambiguous. Further meanings are listed under
Erg .
Physical unit
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Unit name |
erg
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Unit symbol
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Physical quantity (s)
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Energy (e.g. work , internal energy , heat )
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Formula symbol
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dimension
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system
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CGS system of units
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In SI units
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![{\ displaystyle \ mathrm {1 \, erg = 0 {,} 1 \; \ mu J}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/fe7600670180e987bcb108bff651639dbbcfe257)
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In CGS units
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Derived from
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dyn , centimeters
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The erg ( unit symbol : erg; from Greek ἔργον , ergon , work ) is a unit of measurement in the CGS system of units for energy . The unit is widely used in astrophysics and sometimes mechanics .
Except for a power of ten, the erg corresponds to the unit joule , which is common in the MBS- based International System of Units (SI) :
![{\ displaystyle {\ begin {aligned} 1 \ \ mathrm {erg} & = \ mathrm {0 {,} 1 \ \ mu J = 1 \ cdot 10 ^ {- 7} J} \\\ Leftrightarrow 10 ^ {7 } \ \ mathrm {erg} & = 1 \ \ mathrm {J} \ end {aligned}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5c5088fb54ef5ddcaccdbe4243464cd786e6b188)
Considering the dimensions of the energy provides a dimension
energy |
= Force x length
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= Mass · acceleration · length
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= Mass (length / time) 2
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and therefore the unit in the cgs system
![{\ displaystyle {\ begin {aligned} 1 \ \ mathrm {erg} & = \ mathrm {1 \ g \ cdot \ left ({\ frac {cm} {s}} \ right) ^ {2}} \\ & = \ mathrm {1 \ dyn \ cdot \ cm} \ end {aligned}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/bb185830b152b4dbe3ac21d0f92a7d231ec0633e)
with the Dyn .
In Germany, the Erg is no longer a legal unit since January 1, 1978 .
See also