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Void ratio is defined as the volume of voids of the soil divided by the volume of solids, and is represented by the symbol e.

<math>e = V_{voids} / V_{solids} = V_v / V_s</math>

==General Observations==
* Volume change tendency control. If void ratio is high (loose soils) voids in a soil skeleton tend to minimize under loading - adjacent particles contract. The opposite situation, i.e. when void ratio is relatively small (dense soils), indicates that the volume of the soil is vulnerable to increase under loading - particles dilate.

* Hydraulic conductivity control (ability of water movement through the soil). Loose soils show high conductivity, while dense soils are not so permeable.

* Particles movement. In a loose soil particles can move quite easily, whereas in a dense one finer particles cannot pass through the voids, which leads to clogging.

==Library==

* '''Maximum and Minimum Void Ratio Characteristics of Sands''', Misko Cubrinovski and Kenji Ishihara, Soils and Foundations (Japanese Geotechnical Society), Vol. 42, No. 6, December 2002. [[media:Cubrinovski-Ishihara-2002_MaxMinVoidRatioSands.pdf|Download File]] (PDF)

[[Category:Soil Mechanics]]

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