Loschmidt constant (273.15 K, 101.325 kPa) = 2.686 780 111... × 1025 m⁻³
- Value
- 2.686 780 111... × 1025
- Unit
- m⁻³
- Uncertainty
- exact (by definition)
- Copy-ready
2.686780111e25
The Loschmidt constant: the number of molecules of an ideal gas per cubic metre at 0 °C and one standard atmosphere.
Number densities in gas kinetics and atmospheric physics start from it; the 100 kPa value is listed beneath.
The same quantity, other ways NIST lists it
| Quantity (NIST name) | Value | Unit | Uncertainty |
|---|---|---|---|
| Loschmidt constant (273.15 K, 100 kPa) | 2.651 645 804... × 1025 | m⁻³ | exact |
NIST, Fundamental Physical Constants — Complete Listing (2022 CODATA adjustment), retrieved 2026-07-26.
Electrical, thermal and X-ray constants
Angstrom starConductance quantumCopper x unitElectron charge to mass quotientFermi coupling constantFirst radiation constantHartree energyJosephson constantLattice parameter of siliconLattice spacing of ideal Si (220)Loschmidt constant (273.15 K, 101.325 kPa)Magnetic flux quantumMolar mass constantMolar mass of carbon-12Molar Planck constantMolar volume of siliconMolybdenum x unitNeutron-proton mass differenceProton charge to mass quotientQuantum of circulationSackur-Tetrode constant (1 K, 101.325 kPa)Second radiation constantVon Klitzing constantWeak mixing angleWien frequency displacement law constantW to Z mass ratio