Convert Attojoules to Therms
Convert Attojoules (aJ) to Therms (thm) instantly and accurately.
Conversion Formula
thm = aJ × 9.478171203e-27
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 Therms
A therm is the US natural gas billing unit equal to exactly 100,000 BTU = 105,505,585.262 J ≈ 105.5 MJ. One CCF of average US pipeline gas contains ~1.02 therms. The EIA publishes residential gas prices in $/therm; spot prices at Henry Hub are in $/MMBTU (1 MMBTU = 10 therms). US households average 500-700 therms/year for space heating, water heating, and cooking. A 15 kW domestic boiler running 2 hours delivers ~1 therm of useful heat. 1 therm = 100,000 BTU = 105.506 MJ = 29.307 kWh = 25,200 kcal.
Quick Reference Table
| Attojoules (aJ) | Therms (thm) |
|---|---|
| 1 aJ | 9.478 × 10-27 thm |
| 2 aJ | 1.896 × 10-26 thm |
| 5 aJ | 4.739 × 10-26 thm |
| 10 aJ | 9.478 × 10-26 thm |
| 25 aJ | 2.37 × 10-25 thm |
| 50 aJ | 4.739 × 10-25 thm |
| 100 aJ | 9.478 × 10-25 thm |