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Percolation theory deals with fluid flow (or any other similar process) in random media. If the medium is a set of regular Lattice Points, then there are two types of percolation. A Site Percolation considers the lattice vertices as the relevant entities; a Bond Percolation considers the lattice edges as the relevant entities.
See also Bond Percolation, Cayley Tree, Cluster, Cluster Perimeter, Lattice Animal, Percolation Threshold, Polyomino, s-Cluster, s-Run, Site Percolation
References
 
Deutscher, G.; Zallen, R.; and Adler, J. (Eds.).  Percolation Structures and Processes.  Bristol: Adam Hilger, 1983.
 
Finch, S.  ``Favorite Mathematical Constants.''  http://www.mathsoft.com/asolve/constant/rndprc/rndprc.html
 
Grimmett, G.  Percolation.  New York: Springer-Verlag, 1989.
 
Kesten, H.  Percolation Theory for Mathematicians.  Boston, MA: Birkhäuser, 1982.
 
Stauffer, D. and Aharony, A.  Introduction to Percolation Theory, 2nd ed.  London: Taylor & Francis, 1992.
 
 Percolation Theory