mₚ/mₑ · proton-electron mass ratio

양성자-전자 질량비

Takeaway

The relative standard uncertainty fell by a factor of about 343,751 from the 1969 to the 2022 edition (6.0×10⁻⁶ → 1.7×10⁻¹¹): 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 2 outside ±2σ (the bar doubled); the normal expectation is about 1 in 3 and 1 in 22.
The largest move between editions came in 1969→1973, at 3.9 times the combined standard uncertainty of the two editions (|z| = 3.9).

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	1836.109(11)	1.1×10⁻²	6.0×10⁻⁶		3.9703	477 table XXXII
1973	1836.15152(70)	7.0×10⁻⁴	3.8×10⁻⁷	3.8577	1.6478	718 table 33.1
1986	1836.152701(37)	3.7×10⁻⁵	2.0×10⁻⁸	1.6848	−0.7452	codata86 p.10 table 2
1998	1 836.152 6675(39)	3.9×10⁻⁶	2.1×10⁻⁹	−0.9004	1.5195	1998 ASCII:268
2002	1836.152 672 61(85)	8.5×10⁻⁷	4.6×10⁻¹⁰	1.2802	0.9600	2002 ASCII:272
2006	1836.152 672 47(80)	8.0×10⁻⁷	4.4×10⁻¹⁰	−0.1199	1.1950	2006 ASCII:274
2010	1836.152 672 45	7.5×10⁻⁷	4.1×10⁻¹⁰	−0.0182	1.3013	2010 ASCII:274
2014	1836.152 673 89	1.7×10⁻⁷	9.3×10⁻¹¹	1.8725	−2.7294	2014 ASCII:274
2018	1836.152 673 43	1.1×10⁻⁷	6.0×10⁻¹¹	−2.2718	−0.0364	2018 ASCII:279
2022	1836.152 673 426	3.2×10⁻⁸	1.7×10⁻¹¹	−0.0349		2022 ASCII:280