Derived Units

Question

1 erg equals how many joules?

RankGuru · Accepted Answer

The **erg** is the CGS unit of energy, where $1 	ext{ erg} = 1 	ext{ g} \cdot 	ext{cm}^2 \cdot 	ext{s}^{-2}$.
- $1 	ext{ g} = 10^{-3} 	ext{ kg}$
- $1 	ext{ cm}^2 = (10^{-2} 	ext{ m})^2 = 10^{-4} 	ext{ m}^2$
$1 	ext{ erg} = (10^{-3} 	ext{ kg}) \cdot (10^{-4} 	ext{ m}^2) \cdot 	ext{s}^{-2} = 10^{-7} 	ext{ Joules}$.

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