Convert Millijoules to Attojoules
Convert Millijoules (mJ) to Attojoules (aJ) instantly and accurately.
Conversion Formula
aJ = mJ × 1000000000000000
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.
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.
Quick Reference Table
| Millijoules (mJ) | Attojoules (aJ) |
|---|---|
| 1 mJ | 1 × 1015 aJ |
| 2 mJ | 2 × 1015 aJ |
| 5 mJ | 5 × 1015 aJ |
| 10 mJ | 1 × 1016 aJ |
| 25 mJ | 2.5 × 1016 aJ |
| 50 mJ | 5 × 1016 aJ |
| 100 mJ | 1 × 1017 aJ |