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Display constant
M_u · molar mass constant
몰질량 상수
Takeaway
- The relative standard uncertainty barely changed from the 2018 to the 2022 edition (3.0×10⁻¹⁰ → 3.1×10⁻¹⁰).
- The one earlier edition with a measured value has the 2022 value outside ±1σ (the error bar) and outside ±2σ (the bar doubled); the normal expectation is about 1 in 3 and 1 in 22.
- The largest move between editions came in 2018→2022, at 3.2 times the combined standard uncertainty of the two editions (|z| = 3.2).
- Measured from the 2018 edition (exact before).
- Unit
- kg mol⁻¹
- Note
- Exact (1 g/mol) up to the 2014 edition; measured from 2018.
- M1
- —
Value ±1σ by edition2022
| Editionyear of the recommended values (data cut-off) | As printedexactly as in the source table; digits in parentheses are the standard uncertainty in the last digits | Standard uncertaintyhalf-width of the error bar (±1σ) | Relative standard uncertaintystandard uncertainty ÷ |value|: bar width relative to the value | Exactfixed by definition, uncertainty zero | z vs previous editionmove from the previous edition ÷ combined standard uncertainty of the two | z vs 2022(2022 value − this value) ÷ this edition's standard uncertainty | Source locationpage and table of the paper, or file and line of NIST's table |
|---|---|---|---|---|---|---|---|
| 1998 | 1 e-3 | yes | 1998 ASCII:187 | ||||
| 2002 | 1 e-3 | yes | 2002 ASCII:188 | ||||
| 2006 | 1 e-3 | yes | 2006 ASCII:189 | ||||
| 2010 | 1 e-3 | yes | 2010 ASCII:195 | ||||
| 2014 | 1 e-3 | yes | 2014 ASCII:195 | ||||
| 2018 | 0.999 999 999 65 e-3 | 3.0×10⁻¹³ | 3.0×10⁻¹⁰ | 4.6667 | 2018 ASCII:206 | ||
| 2022 | 1.000 000 001 05 e-3 | 3.1×10⁻¹³ | 3.1×10⁻¹⁰ | 3.2453 | 2022 ASCII:207 |