Convert Triple Point of Water to Electronvolt
Convert triple points of water to electronvolts instantly. 1 TPW = 0.0235391075 eV — use the live calculator, the exact formula, a reference-temperature table and worked examples. Also check the Electronvolt to Triple Point of Water converter for the reverse conversion.
Units explained
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
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 to Electronvolt conversion formula
The exact relationship between triple points of water and electronvolts:
To convert triple points of water to electronvolts, multiply the value in triple points of water by 0.02353910754. To reverse, multiply the value in electronvolts by 42.48249422.
Both units count upward from absolute zero, so 0 TPW = 0 eV and the relationship is a pure ratio.
How to use this converter
Type a value into the calculator. The result in electronvolts updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Electronvolt to Triple Point of Water converter for the reverse direction.
Step-by-step: convert triple points of water to electronvolts
- Write down the temperature in triple points of water (TPW).
- Multiply the value in triple points of water by 0.02353910754.
- The result is the same temperature expressed in electronvolts (eV).
- To reverse, multiply the value in electronvolts by 42.48249422 — or open the Electronvolt to Triple Point of Water converter.
Worked examples
Example 1 — Convert 1 TPW to eV:
1 × 0.02353910754 = 0.0235391075 eV
Example 2 — Convert 100 TPW to eV:
100 × 0.02353910754 = 2.3539107539 eV
Triple Point of Water to Electronvolt conversion table
Physically meaningful reference temperatures, from absolute zero to the surface of the Sun, converted from triple points of water to electronvolts:
| Triple Point of Water [TPW] | Electronvolt [eV] | Reference point |
|---|---|---|
| 0 | 0 | Absolute zero |
| 0.8535290672 | 0.0200913125 | Where Celsius and Fahrenheit coincide (−40°) |
| 0.9348814695 | 0.0220062754 | Zero Fahrenheit (0 °F) |
| 0.9999633914 | 0.0235382458 | Water freezes (0 °C / 32 °F) |
| 1 | 0.0235391075 | Triple point of water |
| 1.0365719725 | 0.0243999791 | Cool day (10 °C / 50 °F) |
| 1.0731805535 | 0.0252617125 | Room temperature (20 °C / 68 °F) |
| 1.091484844 | 0.0256925791 | Standard laboratory temperature (25 °C) |
| 1.1097891346 | 0.0261234458 | Hot day (30 °C / 86 °F) |
| 1.1354151413 | 0.0267266591 | Human body temperature (37 °C / 98.6 °F) |
| 1.1463977156 | 0.0269851791 | Heat-wave day (40 °C / 104 °F) |
| 1.1830062967 | 0.0278469124 | Hot tap water (50 °C / 122 °F) |
| 1.3660492019 | 0.0321555791 | Water boils (100 °C / 212 °F) |
| 1.6589178503 | 0.0390494457 | Moderate baking oven (180 °C / 356 °F) |
| 21.1524381315 | 0.4979095159 | Surface of the Sun (≈5,505 °C) |
Frequently asked questions
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Modern Standard Scales (4 units)
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Scientific & Fixed-Point (2 units)
Sources & references
Conversion relationship (1 TPW = 0.0235391075 eV) 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.