erg
Energyexact by definition
The erg is the CGS unit of energy, one dyne centimetre, exactly 10⁻⁷ joules. It is a very small amount of energy, roughly what a mosquito spends on one wingbeat, and it survives almost entirely in astrophysics, where luminosities and burst energies are quoted in ergs and erg per second.
Watch out: A supernova releases about 10⁵¹ erg, a number so entrenched in the literature that it has its own nickname, the foe. That is 10⁴⁴ joules, and the erg figure is the one you will meet in the papers.
| 1 | 1.0000000e-07 |
Where the unit came from
From the Greek ergon, work, named in 1873 by the British Association committee that also gave us the dyne.
One erg in every energy unit
| 624,151,000,000 | electron volt (eV) | |
| 22,937,100,000 | hartree (Eh) | |
| 624,151,000 | kiloelectron volt (keV) | |
| 624,151 | megaelectron volt (MeV) | |
| 624.151 | gigaelectron volt (GeV) | |
| 100 | nanojoule (nJ) | |
| 1 | erg (erg)this unit | |
| 0.624151 | teraelectron volt (TeV) | |
| 0.1 | microjoule (µJ) | |
| 0.0001 | millijoule (mJ) | |
| 8.85075e-07 | inch-pound (in·lb) | |
| 1.00000e-07 | joule (J) | |
| 7.37562e-08 | foot-pound (ft⋅lb) | |
| 2.39006e-08 | calorie (cal) | |
| 2.38846e-08 | calorie (International Table) (cal IT) | |
| 1.00000e-10 | kilojoule (kJ) | |
| 9.48451e-11 | BTU (thermochemical) (BTU th) | |
| 9.47817e-11 | British thermal unit (BTU) | |
| 2.77778e-11 | watt-hour (Wh) | |
| 2.39006e-11 | kilocalorie (kcal) | |
| 1.00000e-13 | megajoule (MJ) | |
| 3.72506e-14 | horsepower-hour (hp·h) | |
| 2.77778e-14 | kilowatt-hour (kWh) | |
| 9.47817e-16 | therm (therm) | |
| 1.00000e-16 | gigajoule (GJ) | |
| 9.47817e-17 | million BTU (MMBTU) | |
| 2.77778e-17 | megawatt-hour (MWh) | |
| 2.39006e-17 | ton of TNT (t TNT) | |
| 2.38846e-18 | tonne of oil equivalent (toe) | |
| 1.00000e-19 | terajoule (TJ) | |
| 2.77778e-20 | gigawatt-hour (GWh) | |
| 2.39006e-20 | kiloton of TNT (kt TNT) | |
| 1.00000e-22 | petajoule (PJ) | |
| 2.77778e-23 | terawatt-hour (TWh) | |
| 2.39006e-23 | megaton of TNT (Mt TNT) | |
| 9.47817e-26 | quad (quad) |
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