Proper noun
van der Waals equation
(chemistry) A gas law which generalizes the ideal gas law to non-ideal gases, taking into account intermolecular forces and the size of molecules.
(
P
+
a
V
2
)
(
V
−
b
)
=
R
T
{\displaystyle (P+{\frac {a}{V^{2}}})(V-b)=RT}
, where
a
{\displaystyle a}
and
b
{\displaystyle b}
are constants experimentally determined for a particular gas.
Synonym: van der Waals law
Van der Waals equation
Alternative letter-case form of van der Waals equation
While superior to the van der Waals equation of state, it performs poorly with respect to the liquid phase and thus cannot be used for accurately calculating vapor–liquid equilibria. Source: Internet
While the van der Waals equation is commonly referenced in text-books and papers for historical reasons, it is now obsolete. Source: Internet