Molar volume of silicon
UnitsMeasured
= 1.205 883 199(60) × 10−5 m3 mol−1
- Value
- 1.205 883 199 × 10−5 m3 mol−1
- Standard uncertainty
- 6 × 10−13 m3 mol−1
- Relative uncertainty
- 5.0 × 10−8 (50 parts per billion)
- Status
- Measured
- Symbol
- Source
- CODATA 2022 via NIST · NIST entry
Use in a calculation
Plain
LaTeX
Python
# molar volume of silicon, CODATA 2022 (NIST)
molar_volume_of_silicon = 1.205883199e-5 # m^3 mol^-1, standard uncertainty 6e-13
# SciPy: scipy.constants.physical_constants['molar volume of silicon']What it is
The volume of one mole of silicon atoms in an ideal crystal: the molar mass of silicon divided by its density. It is central to the X-ray crystal density method of counting atoms.
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 | 1.205 883 199(60) × 10−5 | 5.0 × 10−8 | +0.0 σ of 2018 |
| 2018 | 1.205 883 199(60) × 10−5 | 5.0 × 10−8 | −0.2 σ of 2014 |
| 2014 | 12.058 832 14(61) × 10−6 | 5.1 × 10−8 | −1.1 σ of 2010 |
| 2010 | 12.058 833 01(80) × 10−6 | 6.6 × 10−8 | −1.7 σ of 2006 |
| 2006 | 12.058 8349(11) × 10−6 | 9.1 × 10−8 | −1.4 σ of 2002 |
| 2002 | 12.058 8382(24) × 10−6 | 2.0 × 10−7 |
“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).