Year

Boltzmann’s constant

Achieved relative

uncertainty

Absolute

uncertainty

k_b possible

interval of placing*

Calculated comparative uncertainty

Calculated comparative

uncertainty

Ref.

k · 10²³

m² kg/(s² K)

r_k · 10⁶

Δ_k · 10²⁹

m² kg/(s² K)

u_k · 10²⁹

m² kg/(s² K)

${{\epsilon }^{\prime }}_k={\Delta }_k/u_k$

IACU

${{\epsilon }^{″}}_k={\Delta }_k/S_k$

IARU

2009

1.3806495

2.7

3.73

7.4

0.5038

1.1393

[26]

2010

1.3806496

3.1

4.28

8.8

0.4864

1.3081

[27]

2015

1.3806487

2.0

2.76

2.7

1.0227

0.8439

[28]

2015

1.3806508

1.1

1.52

2.9

0.5237

0.4642

[29]

2017

1.3806488

0.6

0.83

1.6

0.5177

0.2532

[30]

2017

1.3806486

0.7

0.97

2.0

0.4832

0.2954

[31]

2017

1.3806484

2.0

2.76

5.5

0.5020

0.8439

[32]