Explain method of for determination of water content in a soil mass.

Water content,denoted by letter `w`,is defined as the ratio of weight of water to the weight of dry soil.i.e,

$$w=W_w/W_s $$

Water content of a soil mass controls its strength and stability so it is important to determine the water content of a soil mass. The oven-drying method is a standard laboratory method for determining the water content of a soil sample. This is a most accurate method the following steps are followed.

To determine the water content in a laboratory, a sample of wet soil is placed in a container of known  weight and its weight is determined. The soil sample is then placed in an oven with temperatures set between 105 degree centigrade to 110 degree centigrade. The soil is allowed to dry for 24 hours and the weight of the container and dry soil is found out. The following calculation are done to find water content.

Let,

   `W_1=`weight of empty pan (container)

   `W_2=`weight of empty pan plus wet....

Water content,denoted by letter `w`,is defined as the ratio of weight of water to the weight of dry soil.i.e,

$$w=W_w/W_s $$

Water content of a soil mass controls its strength and stability so it is important to determine the water content of a soil mass. The oven-drying method is a standard laboratory method for determining the water content of a soil sample. This is a most accurate method the following steps are followed.

To determine the water content in a laboratory, a sample of wet soil is placed in a container of known  weight and its weight is determined. The soil sample is then placed in an oven with temperatures set between 105 degree centigrade to 110 degree centigrade. The soil is allowed to dry for 24 hours and the weight of the container and dry soil is found out. The following calculation are done to find water content.

Let,

   `W_1=`weight of empty pan (container)

   `W_2=`weight of empty pan plus wet soil

   `W_3=`weight of empty pan plus dry soil.

Now,

Water content,`w=(Weight Of Water)/(Weight of Solid)*100`

Thus,`w=(W_2-W_3)/(W_3-W_1)*100%`