amagat
Number densityexact by definition
One amagat is the number density of an ideal gas at 0 °C and 101.325 kPa, 2.686780111 × 10²⁵ m⁻³, known as the Loschmidt constant. It is exact, because pressure, the Boltzmann constant and the reference temperature are all exact by definition.
Watch out: Some sources define the amagat at 20 °C or at 1 bar instead of 0 °C and 1 atm, which changes it by up to 7%. Spectroscopic databases mean the 0 °C, 101.325 kPa version, and so does this entry.
| 1 | 2.6867801e+25 |
Named for Émile Amagat and used as a density unit in high-pressure gas physics and in atmospheric spectroscopy, where absorption path lengths are quoted in centimetre-amagats so that a measurement is independent of the temperature and pressure the sample happened to be at.
One amagat in every number density unit
| 2.68678e+25 | per cubic meter (m⁻³) | |
| 7.60811e+23 | per cubic foot (ft⁻³) | |
| 2.68678e+22 | per liter (L⁻¹) | |
| 2.68678e+19 | per cubic centimeter (cm⁻³) | |
| 2.68678e+19 | per milliliter (mL⁻¹) | |
| 2.68678e+16 | per microliter (μL⁻¹) | |
| 2.68678e+16 | per cubic millimeter (mm⁻³) | |
| 1 | amagat (amagat)this unit | |
| 0.0000268678 | per cubic angstrom (Å⁻³) |