Year

CoP

Boltzmann’s constant

Achieved relative uncertainty

Absolute uncertainty

k_b possible interval of placing*

Calculated comparative uncertainty

Calculated comparative uncertainty

Ref.

k・10²³

r_k・10⁶

Δ_k・10²⁹

u_k・10²⁹

Ε_k' = Δ_k/u_k

IACU

ε_k'' = Δ_k/S_k

IARU

m² kg/(s² K)

m² kg/(s² K)

m² kg/(s² K)

2009

LMТQ F

1.3806495

2.7

3.73

7.4

0.5038

1.1393

[14]

2010

1.3806496

3.1

4.28

8.8

0.4864

1.3081

[15]

2015

1.3806487

2.0

2.76

2.7

1.0227

0.8439

[16]

2015

1.3806508

1.1

1.52

2.9

0.5237

0.4642

[17]

2017

1.3806488

0.6

0.83

1.6

0.5177

0.2532

[18]

2017

1.3806486

0.7

0.97

2.0

0.4832

0.2954

[19]

2017

1.3806484

2.0

2.76

5.5

0.5020

0.8439

[20]