Ar(e) · electron relative atomic mass

전자의 상대 원자 질량

Takeaway

The relative standard uncertainty fell by a factor of about 350,509 from the 1969 to the 2022 edition (6.2×10⁻⁶ → 1.8×10⁻¹¹): the error bars narrowed that much.
Of 9 earlier editions with a measured value, 8 have the 2022 value outside ±1σ (the error bar) and 1 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 3.7 times the combined standard uncertainty of the two editions (|z| = 3.7).

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	5.485930(34) e-4	3.4×10⁻⁹	6.2×10⁻⁶		−3.8503	477 table XXXII
1973	5.4858026(21) e-4	2.1×10⁻¹⁰	3.8×10⁻⁷	−3.7399	−1.6712	718 table 33.1
1986	5.48579903(13) e-4	1.3×10⁻¹¹	2.4×10⁻⁸	−1.6968	0.4649	codata86 p.9 table 2
1998	5.485 799 110(12) e-4	1.2×10⁻¹²	2.2×10⁻⁹	0.6128	−1.6299	1998 ASCII:95
2002	5.485 799 0945(24) e-4	2.4×10⁻¹³	4.4×10⁻¹⁰	−1.2666	−1.6912	2002 ASCII:96
2006	5.485 799 0943(23) e-4	2.3×10⁻¹³	4.2×10⁻¹⁰	−0.0602	−1.6778	2006 ASCII:97
2010	5.485 799 0946 e-4	2.2×10⁻¹³	4.0×10⁻¹⁰	0.0943	−1.8905	2010 ASCII:102
2014	5.485 799 090 70 e-4	1.6×10⁻¹⁴	2.9×10⁻¹¹	−1.7681	−1.6187	2014 ASCII:102
2018	5.485 799 090 65 e-4	1.6×10⁻¹⁴	2.9×10⁻¹¹	−0.2210	−1.3062	2018 ASCII:109
2022	5.485 799 090 441 e-4	9.7×10⁻¹⁵	1.8×10⁻¹¹	−1.1170		2022 ASCII:110