σ · Stefan–Boltzmann constant

슈테판-볼츠만 상수

Takeaway

The relative standard uncertainty fell by a factor of about 74 from the 1969 to the 2014 edition (1.7×10⁻⁴ → 2.3×10⁻⁶): 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	5.66961(96) e-8	9.6×10⁻¹²	1.7×10⁻⁴			0.7963	478 table XXXII
1973	5.67032(71) e-8	7.1×10⁻¹²	1.3×10⁻⁴		0.5946	0.0766	719 table 33.1
1986	5.67051(19) e-8	1.9×10⁻¹²	3.4×10⁻⁵		0.2585	−0.7136	codata86 p.11 table 2
1998	5.670 400(40) e-8	4.0×10⁻¹³	7.1×10⁻⁶		−0.5665	−0.6395	1998 ASCII:297
2002	5.670 400(40) e-8	4.0×10⁻¹³	7.1×10⁻⁶		0.0000	−0.6395	2002 ASCII:301
2006	5.670 400(40) e-8	4.0×10⁻¹³	7.1×10⁻⁶		0.0000	−0.6395	2006 ASCII:303
2010	5.670 373 e-8	2.1×10⁻¹³	3.7×10⁻⁶		−0.5976	0.0676	2010 ASCII:317
2014	5.670 367 e-8	1.3×10⁻¹³	2.3×10⁻⁶		−0.2429	0.5707	2014 ASCII:317
2018	5.670 374 419... e-8			yes			2018 ASCII:333
2022	5.670 374 419... e-8			yes			2022 ASCII:334