R · molar gas constant

몰 기체 상수

Takeaway

The relative standard uncertainty fell by a factor of about 73 from the 1969 to the 2014 edition (4.2×10⁻⁵ → 5.8×10⁻⁷): the error bars narrowed that much.
All 8 earlier editions with a measured value contain the 2022 value within ±1σ (the error bar). The 2022 value is exact.
The largest move between editions came in 2006→2010, at 0.6 times the combined standard uncertainty of the two editions (|z| = 0.6).
Exact from the 2018 edition (fixed by definition rather than measured), so its uncertainty is zero.

Value ±1σ by edition2022

Relative deviation from the 2022 value (symmetric-log axis). Open circles: the error bar does not reach the 2022 value. Squares: exact.

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
1969	8.31434(35)	3.5×10⁻⁴	4.2×10⁻⁵			0.3503	478 table XXXII
1973	8.31441(26)	2.6×10⁻⁴	3.1×10⁻⁵		0.1605	0.2024	719 table 33.1
1986	8.314510(70)	7.0×10⁻⁵	8.4×10⁻⁶		0.3714	−0.6769	codata86 p.11 table 2
1998	8.314 472(15)	1.5×10⁻⁵	1.8×10⁻⁶		−0.5308	−0.6255	1998 ASCII:186
2002	8.314 472(15)	1.5×10⁻⁵	1.8×10⁻⁶		0.0000	−0.6255	2002 ASCII:187
2006	8.314 472(15)	1.5×10⁻⁵	1.8×10⁻⁶		0.0000	−0.6255	2006 ASCII:188
2010	8.314 4621	7.5×10⁻⁶	9.0×10⁻⁷		−0.5903	0.0691	2010 ASCII:194
2014	8.314 4598	4.8×10⁻⁶	5.8×10⁻⁷		−0.2583	0.5871	2014 ASCII:194
2018	8.314 462 618...			yes			2018 ASCII:205
2022	8.314 462 618...			yes			2022 ASCII:206