= Johannes Diderik van der Waals
{c}
{title2=1837–1923}
= Johannes D. van der Waals
{c}
{synonym}
= J. D. van der Waals
{c}
{synonym}
A <physicist>.https://actorenregister.nationaalarchief.nl/actor-persoon/waals-sr-prof-dr-jd-van-der-te-amsterdam[Independent biographical identity and professional specialization]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/7/7c/Johannes_Diderik_van_der_Waals.jpg]
{title=Portrait of <Johannes Diderik van der Waals>}
{width=240}
The <Van der Waals equation> connects a dilute <gas> model to the possibility of a <liquid-gas critical point>. Its usefulness includes showing how attractions and <excluded volume> can change an <equation of state>; its simple constants do not make it an exact model for every fluid.
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