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<h3 class="section">40.1 Fundamental Constants</h3>
<p><a name="index-fundamental-constants-2653"></a><a name="index-constants_002c-fundamental-2654"></a>
<dl>
<dt><code>GSL_CONST_MKSA_SPEED_OF_LIGHT</code><dd>The speed of light in vacuum, c.
<br><dt><code>GSL_CONST_MKSA_VACUUM_PERMEABILITY</code><dd>The permeability of free space, \mu_0. This constant is defined
in the MKSA system only.
<br><dt><code>GSL_CONST_MKSA_VACUUM_PERMITTIVITY</code><dd>The permittivity of free space, \epsilon_0. This constant is
defined in the MKSA system only.
<br><dt><code>GSL_CONST_MKSA_PLANCKS_CONSTANT_H</code><dd>Planck's constant, h.
<br><dt><code>GSL_CONST_MKSA_PLANCKS_CONSTANT_HBAR</code><dd>Planck's constant divided by 2\pi, \hbar.
<br><dt><code>GSL_CONST_NUM_AVOGADRO</code><dd>Avogadro's number, N_a.
<br><dt><code>GSL_CONST_MKSA_FARADAY</code><dd>The molar charge of 1 Faraday.
<br><dt><code>GSL_CONST_MKSA_BOLTZMANN</code><dd>The Boltzmann constant, k.
<br><dt><code>GSL_CONST_MKSA_MOLAR_GAS</code><dd>The molar gas constant, R_0.
<br><dt><code>GSL_CONST_MKSA_STANDARD_GAS_VOLUME</code><dd>The standard gas volume, V_0.
<br><dt><code>GSL_CONST_MKSA_STEFAN_BOLTZMANN_CONSTANT</code><dd>The Stefan-Boltzmann radiation constant, \sigma.
<br><dt><code>GSL_CONST_MKSA_GAUSS</code><dd>The magnetic field of 1 Gauss.
</dl>
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