Convert Electronvolt to Triple Point of Water
Convert electronvolts to triple points of water instantly. 1 eV = 42.4824942215 TPW — use the live calculator, the exact formula, a reference-temperature table and worked examples. Also check the Triple Point of Water to Electronvolt converter for the reverse conversion.
Units explained
Electronvolt
As a temperature unit, one electronvolt (eV) is the temperature at which a particle's characteristic thermal energy kT equals one electronvolt — exactly 11,604.51812 kelvins under the 2019 SI definitions of e and k.
Comes from the plasma-physics and astrophysics habit of quoting temperatures directly as energies through the Boltzmann relation E = kT, which removes constant unit conversions from the equations of hot ionized matter.
Standard in plasma physics, fusion research, and high-energy astrophysics: the core plasma of a tokamak runs at tens of kiloelectronvolts, while the Sun's core is about 1.3 keV.
Grew out of 20th-century particle- and plasma-physics convention; its kelvin equivalent became an exact number when the 2019 SI revision fixed both the elementary charge and the Boltzmann constant.
Triple Point of Water
The triple point of water is the unique state at which ice, liquid water, and water vapor coexist in equilibrium — exactly 273.16 K (0.01 °C). Treated as a converter unit, 1 triple point of water equals exactly 273.16 kelvins.
Adopted as thermometry's master fixed point because it is exactly reproducible in a sealed glass cell, unlike freezing and boiling points, which shift with atmospheric pressure and dissolved impurities.
Calibration laboratories and the International Temperature Scale of 1990 (ITS-90); from 1954 to 2019 the kelvin itself was defined as exactly 1/273.16 of this temperature.
Fixed at exactly 273.16 K by the 10th CGPM in 1954; it remained the kelvin's defining point until the 2019 SI redefinition through the Boltzmann constant.
Electronvolt to Triple Point of Water conversion formula
The exact relationship between electronvolts and triple points of water:
To convert electronvolts to triple points of water, multiply the value in electronvolts by 42.48249422. To reverse, multiply the value in triple points of water by 0.02353910754.
Both units count upward from absolute zero, so 0 eV = 0 TPW and the relationship is a pure ratio.
How to use this converter
Type a value into the calculator. The result in triple points of water updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Triple Point of Water to Electronvolt converter for the reverse direction.
Step-by-step: convert electronvolts to triple points of water
- Write down the temperature in electronvolts (eV).
- Multiply the value in electronvolts by 42.48249422.
- The result is the same temperature expressed in triple points of water (TPW).
- To reverse, multiply the value in triple points of water by 0.02353910754 — or open the Triple Point of Water to Electronvolt converter.
Worked examples
Example 1 — Convert 1 eV to TPW:
1 × 42.48249422 = 42.4824942215 TPW
Example 2 — Convert 100 eV to TPW:
100 × 42.48249422 = 4248.2494221519 TPW
Electronvolt to Triple Point of Water conversion table
Physically meaningful reference temperatures, from absolute zero to the surface of the Sun, converted from electronvolts to triple points of water:
| Electronvolt [eV] | Triple Point of Water [TPW] | Reference point |
|---|---|---|
| 0 | 0 | Absolute zero |
| 0.0200913125 | 0.8535290672 | Where Celsius and Fahrenheit coincide (−40°) |
| 0.0220062754 | 0.9348814695 | Zero Fahrenheit (0 °F) |
| 0.0235382458 | 0.9999633914 | Water freezes (0 °C / 32 °F) |
| 0.0235391075 | 1 | Triple point of water |
| 0.0243999791 | 1.0365719725 | Cool day (10 °C / 50 °F) |
| 0.0252617125 | 1.0731805535 | Room temperature (20 °C / 68 °F) |
| 0.0256925791 | 1.091484844 | Standard laboratory temperature (25 °C) |
| 0.0261234458 | 1.1097891346 | Hot day (30 °C / 86 °F) |
| 0.0267266591 | 1.1354151413 | Human body temperature (37 °C / 98.6 °F) |
| 0.0269851791 | 1.1463977156 | Heat-wave day (40 °C / 104 °F) |
| 0.0278469124 | 1.1830062967 | Hot tap water (50 °C / 122 °F) |
| 0.0321555791 | 1.3660492019 | Water boils (100 °C / 212 °F) |
| 0.0390494457 | 1.6589178503 | Moderate baking oven (180 °C / 356 °F) |
| 0.4979095159 | 21.1524381315 | Surface of the Sun (≈5,505 °C) |
Frequently asked questions
How many triple points of water is 1 electronvolt?
How do I convert electronvolts to triple points of water?
How do I convert triple points of water back to electronvolts?
How many triple points of water is 100 electronvolts?
Can a temperature be below absolute zero?
Popular temperature unit conversions
Convert Electronvolt to other temperature units
Show all Electronvolt conversions
Modern Standard Scales (4 units)
Historical Scales (4 units)
Scientific & Fixed-Point (2 units)
Sources & references
Conversion relationship (1 eV = 42.4824942215 TPW) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- BIPM — International Temperature Scale of 1990 (ITS-90)
The internationally agreed practical temperature scale, defining fixed points (including the triple point of water at 273.16 K) and interpolation instruments used by national metrology institutes for thermometer calibration worldwide.
- CODATA Internationally Recommended Values of the Fundamental Physical Constants
Committee on Data of the International Science Council; authoritative source for the masses of fundamental particles (electron, proton, neutron) and the atomic mass constant.