159 lines
6.1 KiB
Plaintext
159 lines
6.1 KiB
Plaintext
within Modelica;
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package Constants
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"Library of mathematical constants and constants of nature (e.g., pi, eps, R, sigma)"
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import SI = Modelica.SIunits;
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import NonSI = Modelica.SIunits.Conversions.NonSIunits;
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extends Modelica.Icons.Library2;
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// Mathematical constants
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final constant Real e=Modelica.Math.exp(1.0);
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final constant Real pi=2*Modelica.Math.asin(1.0); // 3.14159265358979;
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final constant Real D2R=pi/180 "Degree to Radian";
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final constant Real R2D=180/pi "Radian to Degree";
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// Machine dependent constants
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// (the definition is a temporary fix since not adapted to the
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// machine where the Modelica translator is running)
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final constant Real eps=1.e-15 "Biggest number such that 1.0 + eps = 1.0";
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final constant Real small=1.e-60
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"Smallest number such that small and -small are representable on the machine";
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final constant Real inf=1.e+60
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"Biggest Real number such that inf and -inf are representable on the machine";
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final constant Integer Integer_inf=2147483647
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"Biggest Integer number such that Integer_inf and -Integer_inf are representable on the machine";
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// Constants of nature
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// (name, value, description from http://physics.nist.gov/cuu/Constants/)
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final constant SI.Velocity c=299792458 "Speed of light in vacuum";
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final constant SI.Acceleration g_n=9.80665
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"Standard acceleration of gravity on earth";
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final constant Real G(final unit="m3/(kg.s2)") = 6.6742e-11
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"Newtonian constant of gravitation";
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final constant SI.FaradayConstant F = 9.64853399e4 "Faraday constant, C/mol";
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final constant Real h(final unit="J.s") = 6.6260693e-34 "Planck constant";
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final constant Real k(final unit="J/K") = 1.3806505e-23 "Boltzmann constant";
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final constant Real R(final unit="J/(mol.K)") = 8.314472 "Molar gas constant";
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final constant Real sigma(final unit="W/(m2.K4)") = 5.670400e-8
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"Stefan-Boltzmann constant";
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final constant Real N_A(final unit="1/mol") = 6.0221415e23
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"Avogadro constant";
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final constant Real mue_0(final unit="N/A2") = 4*pi*1.e-7 "Magnetic constant";
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final constant Real epsilon_0(final unit="F/m") = 1/(mue_0*c*c)
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"Electric constant";
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final constant NonSI.Temperature_degC T_zero=-273.15
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"Absolute zero temperature";
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annotation (
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Documentation(info="<html>
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<p>
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This package provides often needed constants from mathematics, machine
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dependent constants and constants from nature. The latter constants
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(name, value, description) are from the following source:
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</p>
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<dl>
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<dt>Peter J. Mohr and Barry N. Taylor (1999):</dt>
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<dd><b>CODATA Recommended Values of the Fundamental Physical Constants: 1998</b>.
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Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and
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Reviews of Modern Physics, Vol. 72, No. 2, 2000. See also <a href=
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\"http://physics.nist.gov/cuu/Constants/\">http://physics.nist.gov/cuu/Constants/</a></dd>
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</dl>
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<p>CODATA is the Committee on Data for Science and Technology.</p>
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<dl>
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<dt><b>Main Author:</b></dt>
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<dd><a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a><br>
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Deutsches Zentrum für Luft und Raumfahrt e. V. (DLR)<br>
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Oberpfaffenhofen<br>
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Postfach 11 16<br>
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D-82230 Weßling<br>
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email: <a href=\"mailto:Martin.Otter@dlr.de\">Martin.Otter@dlr.de</a></dd>
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</dl>
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<p>
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Copyright © 1998-2009, Modelica Association and DLR.
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</p>
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<p>
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<i>This Modelica package is <b>free</b> software; it can be redistributed and/or modified
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under the terms of the <b>Modelica license</b>, see the license conditions
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and the accompanying <b>disclaimer</b>
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<a href=\"Modelica://Modelica.UsersGuide.ModelicaLicense\">here</a>.</i>
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</p><br>
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</html>
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", revisions="<html>
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<ul>
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<li><i>Nov 8, 2004</i>
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by <a href=\"http://www.robotic.dlr.de/Christian.Schweiger/\">Christian Schweiger</a>:<br>
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Constants updated according to 2002 CODATA values.</li>
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<li><i>Dec 9, 1999</i>
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by <a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a>:<br>
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Constants updated according to 1998 CODATA values. Using names, values
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and description text from this source. Included magnetic and
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electric constant.</li>
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<li><i>Sep 18, 1999</i>
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by <a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a>:<br>
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Constants eps, inf, small introduced.</li>
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<li><i>Nov 15, 1997</i>
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by <a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a>:<br>
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Realized.</li>
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</ul>
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</html>"),
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Invisible=true,
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Text(
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end Constants;
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