Convert Attojoules to Petajoules
Convert Attojoules (aJ) to Petajoules (PJ) instantly and accurately.
Conversion Formula
PJ = aJ × 1.000000000e-33
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 Petajoules
A petajoule (PJ) is 10¹⁵ J - the national energy policy scale. IEA reports primary energy in PJ/year: Sweden ~600 PJ; Germany ~12,500 PJ; the United States ~93,000 PJ. World total primary energy supply is ~605,000 PJ = 605 EJ. The 1883 Krakatoa eruption released ~200 PJ ≈ 48 megatons TNT. A 1-megaton nuclear weapon releases 4.184 PJ. Global annual steel production embeds ~38,000-47,000 PJ of energy. 1 PJ = 10¹⁵ J = 277.78 GWh = 238.85 ktoe = 23.88 ktoe.
Quick Reference Table
| Attojoules (aJ) | Petajoules (PJ) |
|---|---|
| 1 aJ | 1 × 10-33 PJ |
| 2 aJ | 2 × 10-33 PJ |
| 5 aJ | 5 × 10-33 PJ |
| 10 aJ | 1 × 10-32 PJ |
| 25 aJ | 2.5 × 10-32 PJ |
| 50 aJ | 5 × 10-32 PJ |
| 100 aJ | 1 × 10-31 PJ |