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<p>quantum effect, the reason for the pairing can be seen from a simplified classical explanation. An electron in a <a href="page.php?w=metal">metal</a> normally behaves as a <a href="page.php?w=free_particle">free particle</a>. The electron is repelled from other electrons due to their negative <a href="page.php?w=charge_%28physics%29">charge</a>, but it also attracts the positive <a href="page.php?w=ion">ion</a>s that make up the rigid lattice of the metal. This attraction distorts the ion lattice, moving the ions slightly toward the electron,</p><p>
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