Electronvolts (eV) to Calories (cal) Conversion
Electronvolts
The electronvolt (eV) is a unit of energy equal to exactly 1.602176634 × 10⁻¹⁹ joules, defined as the kinetic energy gained by a single electron accelerated through a potential difference of one volt. It is the standard unit in particle physics, atomic physics, and solid-state physics. Visible light photons carry 1.8–3.1 eV of energy; X-ray photons carry 100 eV to 100 keV; the proton beams at CERN's LHC reach 6.5 teraelectronvolts (TeV).
Calories
The calorie (cal) is a unit of energy equal to exactly 4.184 joules, defined as the energy required to raise the temperature of one gram of water by one degree Celsius at 15 °C. This is the thermochemical calorie — distinct from the food calorie (written as Cal or kcal), which is 1,000 times larger. The calorie originated in 19th-century thermodynamics before the joule was established as the SI standard, and persists in chemistry, biology, and food science.
| Electronvolts (eV) | Calories (cal) |
|---|---|
| 0.1 eV | 3.8292940583174E-21 cal |
| 1 eV | 3.8292940583174E-20 cal |
| 2 eV | 7.6585881166348E-20 cal |
| 3 eV | 1.1487882174952E-19 cal |
| 5 eV | 1.9146470291587E-19 cal |
| 10 eV | 3.8292940583174E-19 cal |
| 20 eV | 7.6585881166348E-19 cal |
| 30 eV | 1.1487882174952E-18 cal |
| 50 eV | 1.9146470291587E-18 cal |
| 100 eV | 3.8292940583174E-18 cal |
| 1000 eV | 3.8292940583174E-17 cal |