Convert Ergs to Kilojoules
Convert Ergs (erg) to Kilojoules (kJ) instantly and accurately.
Conversion Formula
kJ = erg × 1.000000000e-10
About Ergs
An erg is the CGS unit of energy - the work done by one dyne through one centimetre - exactly 10⁻⁷ J. Despite SI adoption, the erg persists in astrophysics: the Sun's luminosity is 3.828 × 10³³ erg/s; gamma-ray burst isotropic energies are quoted in units of 10⁵¹ erg ('one foe'). Surface tension of water is 72.8 dyn/cm; the work to create 1 cm² of new water-air interface is 72.8 erg. Earthquake seismic moment M₀ is in dyn·cm = erg; the 2004 Boxing Day earthquake had M₀ ≈ 10²³ J = 10³⁰ erg. 1 erg = 10⁻⁷ J = 624.15 eV.
About Kilojoules
A kilojoule (kJ) is exactly 1,000 J and is the standard energy unit for food and physical chemistry. EU, Australian, and NZ food labels are mandatory in kJ: recommended adult intake is ~8,400 kJ/day. Bond dissociation energies: C-H bond 413 kJ/mol; C=C double bond 614 kJ/mol; N≡N triple bond 945 kJ/mol. Specific heat of water: 4.184 kJ/(kg·K). A cyclist riding at 150 W for one hour expends 540 kJ. Charpy and Izod impact toughness tests record results in J and kJ. 1 kJ = 1,000 J = 239.0 cal = 0.94782 BTU = 0.27778 Wh.
Quick Reference Table
| Ergs (erg) | Kilojoules (kJ) |
|---|---|
| 1 erg | 1 × 10-10 kJ |
| 2 erg | 2 × 10-10 kJ |
| 5 erg | 5 × 10-10 kJ |
| 10 erg | 1 × 10-9 kJ |
| 25 erg | 2.5 × 10-9 kJ |
| 50 erg | 5 × 10-9 kJ |
| 100 erg | 1 × 10-8 kJ |