a1 United Glass Bottle Manufacturers, Ltd
a2 United Kingdom Atomic Energy Research Establishment Harwell, Near Didcot, Berks
The paper studies, in a general way, how the random properties of a ‘medium’ influence the percolation of a ‘fluid’ through it. The treatment diifers from conventional diffusion theory, in which it is the random properties of the fluid that matter. Fluid and medium bear general interpretations: for example, solute diffusing through solvent, electrons migrating over an atomic lattice, molecules penetrating a porous solid, disease infecting a community, etc.
(Received August 15 1956)