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<p> is the <a href="page.php?w=Boltzmann_constant">Boltzmann constant</a> and where   is the meanconcentration of charges of species .</p>

<p>Identifying the instantaneous concentrations and potential in the Poisson equation with their mean-field counterparts in the Boltzmann distribution yields the <a href="page.php?w=Poisson-Boltzmann_equation">Poisson-Boltzmann equation</a>:</p>

<p>Solutions to this nonlinear equation are known for some simple systems. Solutions for more general systems may be obtained in the high-temperature (weak coupling)</p><p>
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