Convert Electronvolts to British Thermal Units
Convert Electronvolts (eV) to British Thermal Units (BTU) instantly and accurately.
Conversion Formula
BTU = eV × 1.518570443e-22
About Electronvolts
An electronvolt (eV) is the kinetic energy gained by one electron accelerated through 1 volt - exactly 1.602176634 × 10⁻¹⁹ J (fixed by the 2019 SI revision). It is the natural energy unit of atomic and particle physics: visible light photons carry 1.7-3.1 eV; hydrogen ionisation requires 13.6 eV; X-ray photons span 100 eV-100 keV; protons at the LHC reach 6.5 TeV. Rest masses use eV/c²: electron 0.511 MeV, proton 938.3 MeV, Higgs boson 125 GeV. Nuclear binding energy peaks at ~8 MeV/nucleon for iron-56. 1 eV = 1.602176634 × 10⁻¹⁹ J.
About British Thermal Units
A British Thermal Unit (BTU) - the heat to raise 1 lb of water by 1°F - equals exactly 1,055.05585262 J. It dominates US HVAC: room air conditioners are rated in BTU/h (5,000-24,000 BTU/h = 1.5-7.0 kW); one ton of refrigeration is exactly 12,000 BTU/h. Natural gas is billed in therms (100,000 BTU) in the US. Higher heating values: natural gas ~1,020-1,050 BTU/ft³; No. 2 fuel oil ~138,700 BTU/US gal; propane ~91,500 BTU/US gal. 1 BTU = 1,055.06 J = 252.164 cal = 0.29307 Wh.
Quick Reference Table
| Electronvolts (eV) | British Thermal Units (BTU) |
|---|---|
| 1 eV | 1.519 × 10-22 BTU |
| 2 eV | 3.037 × 10-22 BTU |
| 5 eV | 7.593 × 10-22 BTU |
| 10 eV | 1.519 × 10-21 BTU |
| 25 eV | 3.796 × 10-21 BTU |
| 50 eV | 7.593 × 10-21 BTU |
| 100 eV | 1.519 × 10-20 BTU |