Soil as a three phase system -
A soil mass is a porous structure which consist of soil particles. The soil particles are known as soil solids. The pores are known as voids may be filled with air or other gas, water or some other liquid or both. A partially saturated soil may be partially filled with water and the remaining part wite air. The three components of a partially saturated soil are solids, water and air. So illustrates a partially saturated soil mass as a three phase system.
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