Remarks on van der Waals's equation, the cohesion pressure of a gas, and the role of intermolecular forces
Frank, Werner F. X.
FacultiesFakultät für Naturwissenschaften
LicenseStandard (Fassung vom 01.10.2008)
The cohesion pressure of a real gas is considered to be caused by the collision interaction of the gas molecules. The collision duration time of two molecules is taken not to be zero but being of finite value ? This time of collision duration is calculated according to the collision theory of Heinrich Hertz. This leads to a new calculation of the cohesion pressure of the gas which is compared with the van der Waals a-constant. The comparison shows an equivalence of both descriptions of the cohesion pressure for gases consisting of molecules with spherical symmetry. Deviations from spherical symmetry are discussed. The new description doesn"t need the assumption of intermolecular attractive forces for particles with spherical symmetry.
Subject HeadingsVan-der-Waals-Zustandsgleichung [GND]
Intermolecular forces [LCSH]