Void ratio

The void ratio (also called void ratio ) is a parameter for the characterization of a bulk material, a filter cake or powder. It is a measure of how much space the actual solid fills cavities or which he leaves behind in this because of its grain or fracturing within a certain volume. The pores are usually filled with air and / or water.

The void ratio is the ratio of the void volume ( ie the total volume of all fractures, pores and other cavities of the solid ) to the solid volume ( index s for engl. Jointly ) a porous substance. It can also be derived from the porosity of:

Cavity and solid volume together give the total volume of the porous material:

The range of values ​​of the void ratio is between zero ( solid solid without pores, porosity here also zero ) and infinity (no solid existing tree, material consists only of pores, where the porosity is one; theoretical consideration, not practical ).

  • Soil Science
  • Dimensionless size
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