Atomic unit of magnetic flux density
UnitsMeasured
= 2.350 517 570 77(73) × 105 T
- Value
- 2.350 517 570 77 × 105 T
- Standard uncertainty
- 7.3 × 10−5 T
- Relative uncertainty
- 3.1 × 10−10 (311 parts per trillion)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
Plain
LaTeX
Python
# atomic unit of magnetic flux density, CODATA 2022 (NIST)
atomic_unit_of_magnetic_flux_density = 2.35051757077e5 # T, standard uncertainty 7.3e-5
# SciPy: scipy.constants.physical_constants['atomic unit of mag. flux density']What it is
The unit of magnetic flux density in the Hartree system of atomic units, where the electron mass, the elementary charge, ħ and 4πε₀ are all set to 1. Its value here is the SI equivalent of one atomic unit.
How the value changed, 1998–2022
Each point is one CODATA adjustment, plotted as its difference from the 2022 value; the bars show one standard uncertainty (an arrowhead means the bar runs off the chart).
Relative uncertainty
| CODATA | Value (uncertainty) | Relative uncertainty | Change from previous |
|---|---|---|---|
| 2022 | 2.350 517 570 77(73) × 105 | 3.1 × 10−10 | +4.5 σ of 2018 |
| 2018 | 2.350 517 567 58(71) × 105 | 3.0 × 10−10 | +1.3 σ of 2014 |
| 2014 | 2.350 517 550(14) × 105 | 6.0 × 10−9 | +1.7 σ of 2010 |
| 2010 | 2.350 517 464(52) × 105 | 2.2 × 10−8 | +1.4 σ of 2006 |
| 2006 | 2.350 517 382(59) × 105 | 2.5 × 10−8 | −0.2 σ of 2002 |
| 2002 | 2.350 517 42(20) × 105 | 8.5 × 10−8 | +0.8 σ of 1998 |
| 1998 | 2.350 517 349(94) × 105 | 4.0 × 10−8 |
“Change from previous” is the shift in the value divided by the standard uncertainty of the previous adjustment. Earlier values are converted into the current unit where NIST changed it (for example J s to J Hz⁻¹).