Convert Gigajoules to Attojoules
Convert Gigajoules (GJ) to Attojoules (aJ) instantly and accurately.
Conversion Formula
aJ = GJ × 1.000000000e+27
About Gigajoules
A gigajoule (GJ) is 10⁹ J - the scale of fossil-fuel commodity volumes. One barrel of crude oil contains ~5.80 GJ; one metric tonne of hard coal ~29.3 GJ. Canadian energy bills express household consumption in GJ: average Canadian households use ~100-130 GJ/year. A 1 GW power plant at 33% efficiency burns ~10.9 GJ/h of fuel to generate 1 GWh = 3.6 GJ of electricity. Detonation of 1 tonne of TNT releases 4.184 GJ. 1 GJ = 10⁹ J = 277.78 kWh = 947,817 BTU = 9.4782 therms.
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
| Gigajoules (GJ) | Attojoules (aJ) |
|---|---|
| 1 GJ | 1 × 1027 aJ |
| 2 GJ | 2 × 1027 aJ |
| 5 GJ | 5 × 1027 aJ |
| 10 GJ | 1 × 1028 aJ |
| 25 GJ | 2.5 × 1028 aJ |
| 50 GJ | 5 × 1028 aJ |
| 100 GJ | 1 × 1029 aJ |