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Dimensionless quantity related to porosity
The void ratio of a mixture of solids and fluids, or of a porous composite material such as concrete, is the ratio of the volume of the voids filled by the fluids to the volume of all the solids. It is a dimensionless quantity in materials science and in soil science, and is closely related to the porosity (often noted as ϕ {\displaystyle \phi }, or η {\displaystyle {\eta }}, depending on the conv... Wikipedia