Convert Femtojoules to Ergs
Convert Femtojoules (fJ) to Ergs (erg) instantly and accurately.
Conversion Formula
erg = fJ × 1.000000000e-8
About Femtojoules
A femtojoule (fJ) is 10⁻¹⁵ J - the scale of gamma-ray photons, molecular motor work, and state-of-the-art digital logic. The electron rest-mass energy is 81.87 fJ; a 100 keV X-ray photon carries 16.02 fJ. A single myosin II motor protein power stroke dissipates ~5-40 fJ. ATP hydrolysis under cellular conditions yields ~80-100 fJ of free energy. Advanced 3 nm CMOS gates switch at ~0.1-1 fJ per operation. Ultrafast fiber laser oscillators produce pulses of 0.1-10 fJ before amplification. 1 fJ = 10⁻¹⁵ J = 6.242 keV.
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.
Quick Reference Table
| Femtojoules (fJ) | Ergs (erg) |
|---|---|
| 1 fJ | 1 × 10-8 erg |
| 2 fJ | 2 × 10-8 erg |
| 5 fJ | 5 × 10-8 erg |
| 10 fJ | 1 × 10-7 erg |
| 25 fJ | 2.5 × 10-7 erg |
| 50 fJ | 5 × 10-7 erg |
| 100 fJ | 1 × 10-6 erg |