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<p>surface was that it allowed to geometrically explain sharp, discontinuous <a href="page.php?w=phase_transition">phase transition</a>s as emerging from a purely continuous and smooth state function ; Maxwell's surface demonstrated the generic behaviour for a substance that can exist in solid, liquid, and gaseous phases. The basic geometrical operation involved simply placing a <a href="page.php?w=tangent_plane">tangent plane</a> (such as a flat sheet of glass) on the surface and rolling it around, observing where it touches the surface. Using</p><p>
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