Year

CoP

Boltzmann’s constant

Achieved relative uncertainty

Absolute uncertainty

Calculated comparative uncertainty*

Ref.

k・10²³

r_k・10⁵

Δ_k・10²⁸

ε_k'' =Δ_k/S_k

IARU

m² kg/(s² K)

m² kg/(s² K)

2007

LMТQ F

1.38065260

19.0

26.2

110.59

[36]

2008

1.38066952

3.8

5.2

22.119

[37]

2009

1.38080200

14.0

19.9

83.826

[38]

2011

1.38058130

16.0

22.1

93.125

[39]

2014

1.38066120

8.7

12.0

50.640

[40]

2015

1.38066313

2.4

3.3

13.969

[41]