Convert Attojoules to Millijoules
Convert Attojoules (aJ) to Millijoules (mJ) instantly and accurately.
Conversion Formula
mJ = aJ × 1.000000000e-15
About Attojoules
An attojoule (aJ) is 10⁻¹⁸ J - the scale of individual X-ray photons and superconducting qubit circuits. A 1 keV X-ray photon carries 160 aJ; a visible green photon (~550 nm) carries ~0.36 aJ. Josephson junction energies in superconducting qubits are set in tens to hundreds of aJ to achieve quantum coherence at millikelvin temperatures. XRISM's cryogenic TES X-ray spectrometer resolves individual photon energies at the hundreds-of-aJ level with ~7 eV FWHM resolution. 1 aJ = 10⁻¹⁸ J = 6.242 eV.
About Millijoules
A millijoule (mJ) is 10⁻³ J - the scale of surgical lasers, spark ignition, and the kinetic energy of small everyday objects. Nd:YAG lasers for ophthalmology and tattoo removal deliver 10-200 mJ per pulse. The minimum spark energy to ignite methane-air is ~0.29 mJ; an automotive spark plug discharges 30-60 mJ per cycle. A 2 g mosquito flying at 1 m/s has kinetic energy ½ × 0.002 × 1² = 1 mJ. Electrocautery monopolar pulses deliver 50-500 mJ to coagulate blood vessels. 1 mJ = 10⁻³ J = 0.2390 cal.
Quick Reference Table
| Attojoules (aJ) | Millijoules (mJ) |
|---|---|
| 1 aJ | 1 × 10-15 mJ |
| 2 aJ | 2 × 10-15 mJ |
| 5 aJ | 5 × 10-15 mJ |
| 10 aJ | 1 × 10-14 mJ |
| 25 aJ | 2.5 × 10-14 mJ |
| 50 aJ | 5 × 10-14 mJ |
| 100 aJ | 1 × 10-13 mJ |