root/branches/maintenance/2.2.2/Modelica/Constants.mo

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1within Modelica;
2package Constants
3  "Library of mathematical constants and constants of nature (e.g., pi, eps, R, sigma)" 
4 
5  import SI = Modelica.SIunits;
6  import NonSI = Modelica.SIunits.Conversions.NonSIunits;
7 
8  extends Modelica.Icons.Library2;
9 
10  // Mathematical constants
11  constant Real e=Modelica.Math.exp(1.0);
12  constant Real pi=2*Modelica.Math.asin(1.0); // 3.14159265358979;
13  constant Real D2R=pi/180 "Degree to Radian";
14  constant Real R2D=180/pi "Radian to Degree";
15 
16  // Machine dependent constants
17  // (the definition is a temporary fix since not adapted to the
18  // machine where the Modelica translator is running)
19  constant Real eps=1.e-15 "Biggest number such that 1.0 + eps = 1.0";
20  constant Real small=1.e-60 
21    "Smallest number such that small and -small are representable on the machine";
22  constant Real inf=1.e+60 
23    "Biggest Real number such that inf and -inf are representable on the machine";
24  constant Integer Integer_inf=2147483647 
25    "Biggest Integer number such that Integer_inf and -Integer_inf are representable on the machine";
26 
27  // Constants of nature
28  // (name, value, description from http://physics.nist.gov/cuu/Constants/)
29  constant SI.Velocity c=299792458 "Speed of light in vacuum";
30  constant SI.Acceleration g_n=9.80665 
31    "Standard acceleration of gravity on earth";
32  constant Real G(final unit="m3/(kg.s2)") = 6.6742e-11 
33    "Newtonian constant of gravitation";
34  constant Real h(final unit="J.s") = 6.6260693e-34 "Planck constant";
35  constant Real k(final unit="J/K") = 1.3806505e-23 "Boltzmann constant";
36  constant Real R(final unit="J/(mol.K)") = 8.314472 "Molar gas constant";
37  constant Real sigma(final unit="W/(m2.K4)") = 5.670400e-8 
38    "Stefan-Boltzmann constant";
39  constant Real N_A(final unit="1/mol") = 6.0221415e23 "Avogadro constant";
40  constant Real mue_0(final unit="N/A2") = 4*pi*1.e-7 "Magnetic constant";
41  constant Real epsilon_0(final unit="F/m") = 1/(mue_0*c*c) "Electric constant";
42  constant NonSI.Temperature_degC T_zero=-273.15 "Absolute zero temperature";
43 
44  annotation (
45    Documentation(info="<html>
46<p>
47This package provides often needed constants from mathematics, machine
48dependent constants and constants from nature. The latter constants
49(name, value, description) are from the following source:
50</p>
51
52<dl>
53<dt>Peter J. Mohr and Barry N. Taylor (1999):</dt>
54<dd><b>CODATA Recommended Values of the Fundamental Physical Constants: 1998</b>.
55    Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, 1999 and
56    Reviews of Modern Physics, Vol. 72, No. 2, 2000. See also <a href=
57\"http://physics.nist.gov/cuu/Constants/\">http://physics.nist.gov/cuu/Constants/</a></dd>
58</dl>
59
60<p>CODATA is the Committee on Data for Science and Technology.</p>
61
62<dl>
63<dt><b>Main Author:</b></dt>
64<dd><a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a><br>
65    Deutsches Zentrum f&uuml;r Luft und Raumfahrt e. V. (DLR)<br>
66    Oberpfaffenhofen<br>
67    Postfach 11 16<br>
68    D-82230 We&szlig;ling<br>
69    email: <a href=\"mailto:Martin.Otter@dlr.de\">Martin.Otter@dlr.de</a></dd>
70</dl>
71
72
73<p>
74Copyright &copy; 1998-2007, Modelica Association and DLR.
75</p>
76<p>
77<i>This Modelica package is <b>free</b> software; it can be redistributed and/or modified
78under the terms of the <b>Modelica license</b>, see the license conditions
79and the accompanying <b>disclaimer</b> 
80<a href=\"Modelica://Modelica.UsersGuide.ModelicaLicense\">here</a>.</i>
81</p><br>
82</html>
83", revisions="<html>
84<ul>
85<li><i>Nov 8, 2004</i>
86       by <a href=\"http://www.robotic.dlr.de/Christian.Schweiger/\">Christian Schweiger</a>:<br>
87       Constants updated according to 2002 CODATA values.</li>
88<li><i>Dec 9, 1999</i>
89       by <a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a>:<br>
90       Constants updated according to 1998 CODATA values. Using names, values
91       and description text from this source. Included magnetic and
92       electric constant.</li>
93<li><i>Sep 18, 1999</i>
94       by <a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a>:<br>
95       Constants eps, inf, small introduced.</li>
96<li><i>Nov 15, 1997</i>
97       by <a href=\"http://www.robotic.dlr.de/Martin.Otter/\">Martin Otter</a>:<br>
98       Realized.</li>
99</ul>
100</html>"),
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137end Constants;
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