search

ucum-org / ucum

https://ucum.org
Other
50 stars 10 forks source link

+Value of Planck Constant #160

Closed timbrisc closed 2 months ago

timbrisc commented 3 years ago

Issue migrated from trac ticket # 5779

component: unit definitions | priority: major

2021-01-15 03:48:52: simon.cox@csiro.au created the issue

The CODATA 2017 value is

6.62607015E−34 J.s

Table 3. in https://iopscience.iop.org/article/10.1088/1681-7575/aa950a/pdf

timbrisc commented 3 years ago

2021-01-15 03:50:45: simon.cox@csiro.au edited the issue description

timbrisc commented 3 years ago

2021-01-15 03:52:47: simon.cox@csiro.au edited the issue description

timbrisc commented 3 years ago

2021-01-15 03:55:38: simon.cox@csiro.au changed title from Update value of Planck Constant to Value of Planck Constant

timbrisc commented 3 years ago

2021-01-15 19:05:11: mitchbre@regenstrief.org changed status from new to assigned

timbrisc commented 3 years ago

2021-01-15 19:05:11: mitchbre@regenstrief.org set owner to Christof Gessner

timbrisc commented 3 years ago

2021-01-21 08:13:11: simon.cox@csiro.au

timbrisc commented 3 years ago

2021-02-15 13:48:25: gessner@mxdx.de commented

As described in the quoted paper, the recent redefinition of the SI resulted in modified values for a number of fundamental constants.

quote: "Sufficient progress towards redefining the International System of Units (SI) in terms of exact values of fundamental constants has been achieved. Exact values of the Planck constant h, elementary charge e, Boltzmann constant k, and Avogadro constant NA from the CODATA 2017 Special Adjustment of the Fundamental Constants are presented here. These values are recommended to the 26th General Conference on Weights and Measures to form the foundation of the revised SI."

The value of the Planck Constant in UCUM shall be changed to 6.62607015E−34 J.s

Remark: This issue relates to an overarching question, to be addressed in a separate ticket: What is the normative content of UCUM? Specifically, are the constants and conversion factors in UCUM a non-normative convenience function, or are they part of the normative system. If so, a thourough revision of all numerical values and their sources is required, in addition to a sustainable governance process to keep numbers updated.

timbrisc commented 3 years ago

2021-02-15 13:50:30: gessner@mxdx.de commented

Planck constant h action 6.62607015 × 10 -34
timbrisc commented 3 years ago

2021-02-19 14:00:42: mitchbre@regenstrief.org changed status from assigned to accepted

timbrisc commented 3 years ago

2021-02-19 14:00:42: mitchbre@regenstrief.org changed owner from Christof Gessner to mitchbre

timbrisc commented 3 years ago

2021-02-19 14:15:38: mitchbre@regenstrief.org commented

Constant to be updated

timbrisc commented 2 years ago

2021-11-02 17:43:16: mitchbre@regenstrief.org changed title from Value of Planck Constant to +Value of Planck Constant

timbrisc commented 2 months ago

Existing value 6.6260755e-34

timbrisc commented 2 months ago

Included in v2.2 release