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Void Ratio is defined as the ratio of the volume of voids (Vv) to the volume of solids(Vs) present in a given soil mass. It is represented as 'e'. Porosity (η): It is defined as the ratio of the volume of voids(Vv) to the volume of soil (V) present in the given soil mass. It is represented as 'η'.
Water present in the soil in any form is termed soil water. Many types of sοil water: Ground (Free, Gravity) water, Capillary water, Structural water, and Adsorbed water.
The various techniques for determining the water content of soil are as follows: Oven Drying Method, Sand Bath Method, Alcohol Method, Pycnometer Method, Calcium Carbide or Moisture Meter Method, Radiation Method, and Torsional Balance Method.
Water content (w):It is define as the weight of water to the weight of solids present in the given soil mass. Moisture content (m): It is define as the mass of water to the mass of solids present in the given soil mass. The result of water content & moisture content are same .