Correct Answer - Option 2 : Volume of voids / Total Volume
Explanation:
Porosity (n):
- Porosity is defined as the ratio of the volume of voids to the total volume of the soil.
- In porosity, total volume of soil is used which includes volume of voids. Hence porosity (n) of soil can not exceed 100%.
- The range of porosity is 0 < n < 100%
Void ratio (e):
- Void ratio is usually defined as the ratio of the volume of voids to the total volume of soil solid.
(i) The relationship between void ratio and porosity are as follow:
\(\rm{e=\frac{n}{1-n}\; and\; n=\frac{e}{1+e}}\)
(ii) Void ratio and porosity both have same significances but void ratio is more widely adopted then porosity because volume of solid which is used in void ratio is more stable than total volume used in porosity.
