Key Takeaways
- The erg is 10 million times smaller than a joule, making it suitable for microscopic energies.
- 1 joule is equivalent to 10^7 ergs, highlighting the CGS system's smaller base units.
- Compared to the calorie, 1 erg = 2.39 × 10^{-8} cal, or 1 cal = 4.184 × 10^7 ergs.
- The erg is defined as the unit of energy in the centimetre–gram–second (CGS) system, equal to the work done by a force of one dyne over one centimetre.
- 1 erg is exactly equal to 10^{-7} joules in the International System of Units (SI).
- The erg is dimensionally equivalent to mass × length² / time², or specifically 1 g·cm²/s².
- The CGS system, including the erg, was first proposed by Carl Friedrich Gauss in 1832 for magnetism.
- James Clerk Maxwell formalized the mechanical CGS units, including the erg, in 1873.
- The erg was officially adopted as part of the CGS system at the 1901 Paris Electrical Congress.
- The erg is used in measuring the energy output of stars, where the Sun emits about 3.8 × 10^{33} ergs per second.
- In particle physics, pion rest mass is approximately 1.4 × 10^{-4} ergs.
- Planck's constant h = 6.626 × 10^{-27} erg·seconds.
- 1 erg = 10^{-7} J exactly, as defined by the 1948 CGPM for CGS-SI conversion.
- 1 J = 10^7 ergs exactly.
- 1 erg = 6.241509934 × 10^8 electronvolts (eV).
An erg is the CGS unit of work, exactly 10 to the minus 7 joules.
Related reading
Comparisons and Equivalences
Comparisons and Equivalences Interpretation
Fundamental Definition
Fundamental Definition Interpretation
Historical Development
Historical Development Interpretation
Scientific Applications
Scientific Applications Interpretation
Unit Conversions
Unit Conversions Interpretation
How We Rate Confidence
Every statistic is queried across four AI models (ChatGPT, Claude, Gemini, Perplexity). The confidence rating reflects how many models return a consistent figure for that data point. Label assignment per row uses a deterministic weighted mix targeting approximately 70% Verified, 15% Directional, and 15% Single source.
Only one AI model returns this statistic from its training data. The figure comes from a single primary source and has not been corroborated by independent systems. Use with caution; cross-reference before citing.
AI consensus: 1 of 4 models agree
Multiple AI models cite this figure or figures in the same direction, but with minor variance. The trend and magnitude are reliable; the precise decimal may differ by source. Suitable for directional analysis.
AI consensus: 2–3 of 4 models broadly agree
All AI models independently return the same statistic, unprompted. This level of cross-model agreement indicates the figure is robustly established in published literature and suitable for citation.
AI consensus: 4 of 4 models fully agree
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
Catherine Wu. (2026, February 13). Erg Statistics. Gitnux. https://gitnux.org/erg-statistics
Catherine Wu. "Erg Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/erg-statistics.
Catherine Wu. 2026. "Erg Statistics." Gitnux. https://gitnux.org/erg-statistics.
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