Molecular forces between solids
the total force acting on body 2 can be computed as the total flux
of momentum flowing into the body from the medium which surrounds
it
medium is in thermodynamic equilibrium: constancy of its chemical
potential
Thin films on the surface of a solid
chemical potential of a film
the general theory of van der Waals' forces developed here can also be
applied for calculating thermodynamic quantities for a thin liquid film
located on the surface of a solid; the thickness l of the film is, of
course, assumed to be large compared with interatomic distances
Methods of quantum field theory in statistical physics
a characteristic feature of present day quantum field theory is the
extensive use of the Feynman diagram technique, which makes it possible
to give a very pictorial presentation of the structure and character
of any approximation
the Feynman diagram technique is based on the following two properties of the
equations of field theory: first, on the possibility of representing
all quantities of the theory as averages of ordered products of various
numbers of field operators
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