.Modelica.Constants

Information

This package provides often needed constants from mathematics, machine dependent constants and constants from nature. The latter constants (name, value, description) are from the following source (based on the second source):

Michael Stock, Richard Davis, Estefanía de Mirandés and Martin J T Milton:

The revision of the SI-the result of three decades of progress in metrology in Metrologia, Volume 56, Number 2. https://iopscience.iop.org/article/10.1088/1681-7575/ab0013/pdf, 2019.

D B Newell, F Cabiati, J Fischer, K Fujii, S G Karshenboim, H S Margolis , E de Mirandés, P J Mohr, F Nez, K Pachucki, T J Quinn, B N Taylor, M Wang, B M Wood and Z Zhang:

The CODATA 2017 values of h, e, k, and NA for the revision of the SI in Metrologia, Volume 55, Number 1. https://iopscience.iop.org/article/10.1088/1681-7575/aa950a/pdf, 2017.

BIPM is Bureau International des Poids et Mesures (they publish the SI-standard).

CODATA is the Committee on Data for Science and Technology.

Main Author:

Martin Otter
Deutsches Zentrum für Luft und Raumfahrt e. V. (DLR)
Oberpfaffenhofen
Postfach 1116
D-82230 Weßling
email: Martin.Otter@dlr.de

Copyright © 1998-2020, Modelica Association and contributors

Revisions

• Dec 4, 2019 by Thomas Beutlich:
  Constant G updated according to 2018 CODATA value.
• Mar 25, 2019 by Hans Olsson:
  Constants updated according to 2017 CODATA values and new SI-standard.
• Nov 4, 2015 by Thomas Beutlich:
  Constants updated according to 2014 CODATA values.
• Nov 8, 2004 by Christian Schweiger:
  Constants updated according to 2002 CODATA values.
• Dec 9, 1999 by Martin Otter:
  Constants updated according to 1998 CODATA values. Using names, values and description text from this source. Included magnetic and electric constant.
• Sep 18, 1999 by Martin Otter:
  Constants eps, inf, small introduced.
• Nov 15, 1997 by Martin Otter:
  Realized.