Ar(p) · proton relative atomic mass

양성자의 상대 원자 질량

Takeaway

The relative standard uncertainty fell by a factor of about 9,639 from the 1969 to the 2022 edition (7.9×10⁻⁸ → 8.2×10⁻¹²): the error bars narrowed that much.
Of 9 earlier editions with a measured value, 6 have the 2022 value outside ±1σ (the error bar) and 4 outside ±2σ (the bar doubled); the normal expectation is about 1 in 3 and 1 in 22.
The largest move between editions came in 2014→2018, at 2.4 times the combined standard uncertainty of the two editions (|z| = 2.4).

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	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	1.00727661(8)	8.0×10⁻⁸	7.9×10⁻⁸		−1.7928	477 table XXXII
1973	1.007276470(11)	1.1×10⁻⁸	1.1×10⁻⁸	−1.7337	−0.3110	718 table 33.1
1986	1.007276470(12)	1.2×10⁻⁸	1.2×10⁻⁸	0.0000	−0.2851	codata86 p.10 table 2
1998	1.007 276 466 88(13)	1.3×10⁻¹⁰	1.3×10⁻¹⁰	−0.2600	−2.3162	1998 ASCII:266
2002	1.007 276 466 88(13)	1.3×10⁻¹⁰	1.3×10⁻¹⁰	0.0000	−2.3162	2002 ASCII:269
2006	1.007 276 466 77(10)	1.0×10⁻¹⁰	9.9×10⁻¹¹	−0.6707	−1.9110	2006 ASCII:271
2010	1.007 276 466 812	9.0×10⁻¹¹	8.9×10⁻¹¹	0.3122	−2.5900	2010 ASCII:285
2014	1.007 276 466 879	9.1×10⁻¹¹	9.0×10⁻¹¹	0.5235	−3.2978	2014 ASCII:285
2018	1.007 276 466 621	5.3×10⁻¹¹	5.3×10⁻¹¹	−2.4499	−0.7943	2018 ASCII:290
2022	1.007 276 466 5789	8.3×10⁻¹²	8.2×10⁻¹²	−0.7848		2022 ASCII:291