Erg (erg)
CGS unit: exactly 1e-7 joules (one dyne-centimeter).
What is an erg?
- Symbol
- erg
- Quantity
- Energy
- Unit system
- CGS
- Definition
- CGS unit: exactly 1e-7 joules (one dyne-centimeter).
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
The CGS unit of energy, still found in astronomy and older physics literature.
Erg in other energy units
- 1 erg = 1e-7 JJoule
- 1 erg = 1e-10 kJKilojoule
- 1 erg = 1e-13 MJMegajoule
- 1 erg ≈ 2.777777778e-11 WhWatt-hour
- 1 erg ≈ 2.777777778e-14 kWhKilowatt-hour
- 1 erg ≈ 2.390057361e-8 calCalorie (thermochemical)
- 1 erg ≈ 2.390057361e-11 kcalKilocalorie (thermochemical)
- 1 erg ≈ 9.478171203e-11 BTUBritish thermal unit (IT)
- 1 erg ≈ 7.375621493e-8 ft·lbfFoot-pound-force
- 1 erg ≈ 624150907400 eVElectronvolt
Erg quick reference
| Erg | Kilojoule | Kilocalorie (thermochemical) | Joule |
|---|---|---|---|
| 1 erg | = 1e-10 kJ | ≈ 2.390057361e-11 kcal | = 1e-7 J |
| 10 erg | = 1e-9 kJ | ≈ 2.390057361e-10 kcal | = 0.000001 J |
| 100 erg | = 1e-8 kJ | ≈ 2.390057361e-9 kcal | = 0.00001 J |
| 1000 erg | = 1e-7 kJ | ≈ 2.390057361e-8 kcal | = 0.0001 J |
Where the erg fits
The next smaller energy unit is the electronvolt (eV). 1 erg ≈ 624150907400 eV, and 1 eV = 1.602176634e-12 erg.
The next larger energy unit is the joule (J). 1 erg = 1e-7 J, and 1 J = 10000000 erg.
Frequently asked questions
- How many kilojoules are in one erg?
- One erg = 1e-10 kJ (kilojoules).
- How many kilocalories are in one erg?
- One erg ≈ 2.390057361e-11 kcal (kilocalories).
- How many joules are in one erg?
- One erg = 1e-7 J (joules).