<a href="https://en.wikipedia.org/wiki/Maxwell%27s_thermodynamic_surface" class="extiw" title="w:Maxwell's thermodynamic surface">Maxwell's thermodynamic surface</a>.
<p>Photos from "<a rel="nofollow" class="external text" href="https://archive.org/stream/commentaryonscie01donn/#page/51/mode/1up">A commentary on the scientific writings of J. Willard Gibbs</a>", 1936. (<a rel="nofollow" class="external text" href="https://exhibits.stanford.edu/copyrightrenewals">copyright lapsed without renewal</a>)
</p><p>See also:
</p>
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