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<title>GNU Scientific Library &ndash; Reference Manual: Fundamental Constants</title>

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<a name="Fundamental-Constants"></a>
<div class="header">
<p>
Next: <a href="Astronomy-and-Astrophysics.html#Astronomy-and-Astrophysics" accesskey="n" rel="next">Astronomy and Astrophysics</a>, Up: <a href="Physical-Constants.html#Physical-Constants" accesskey="u" rel="up">Physical Constants</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Fundamental-Constants-1"></a>
<h3 class="section">44.1 Fundamental Constants</h3>
<a name="index-fundamental-constants"></a>
<a name="index-constants_002c-fundamental"></a>
<dl compact="compact">
<dt><code>GSL_CONST_MKSA_SPEED_OF_LIGHT</code></dt>
<dd><p>The speed of light in vacuum, <em>c</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_VACUUM_PERMEABILITY</code></dt>
<dd><p>The permeability of free space, <em>\mu_0</em>. This constant is defined
in the MKSA system only.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_VACUUM_PERMITTIVITY</code></dt>
<dd><p>The permittivity of free space, <em>\epsilon_0</em>.  This constant is
defined in the MKSA system only.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_PLANCKS_CONSTANT_H</code></dt>
<dd><p>Planck&rsquo;s constant, <em>h</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_PLANCKS_CONSTANT_HBAR</code></dt>
<dd><p>Planck&rsquo;s constant divided by <em>2\pi</em>, <em>\hbar</em>.
</p>
</dd>
<dt><code>GSL_CONST_NUM_AVOGADRO</code></dt>
<dd><p>Avogadro&rsquo;s number, <em>N_a</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_FARADAY</code></dt>
<dd><p>The molar charge of 1 Faraday.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_BOLTZMANN</code></dt>
<dd><p>The Boltzmann constant, <em>k</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_MOLAR_GAS</code></dt>
<dd><p>The molar gas constant, <em>R_0</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_STANDARD_GAS_VOLUME</code></dt>
<dd><p>The standard gas volume, <em>V_0</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_STEFAN_BOLTZMANN_CONSTANT</code></dt>
<dd><p>The Stefan-Boltzmann radiation constant, <em>\sigma</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_GAUSS</code></dt>
<dd><p>The magnetic field of 1 Gauss.
</p></dd>
</dl>




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