In chemistry and other physical sciences, percolation is a type of filtering.
In other processes and systems
An abstract mathematical model of percolation can be applied to other processes, which are then also called percolation, that share the mathematical description in common with the filtering process. For that abstract treatment, see percolation theory.
The ability of soil to absorb water is known as soil percolation.
In specifying the size and type of absorption field (drain field, leach field, seepage pits) a soil percolation test or "perc test" should be performed.
If the water drains very slowly or remains in the hole with no drop in level by the next morning, the soil percolation is considered bad and will require soil exchange or other special design measures.
In mathematics, percolation theory describes the behavior of connected clusters in a random graph.
The applications of percolation theory to materials science and other domains is discussed in the article percolation.
In dimension 2, the first fact ("no percolation in the critical phase") is proved for all latices, but the rest have only been proved for site percolation on the honeycomb or hexagonal lattice, and of course, universality is not proved.
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