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Void ratio is the ratio of the volume of the voids to the volume of the soil solids and Porosity of the soil mass is the ratio of the volume of voids to the total volume of the given soil. What would be the expression to related these two terms? (Assume void ratio = e and porosity = n)


1. n = (e + 1)/e
2. e = m/(1 + n)
3. n = e/(1 + e)
4. n = 2e2/(1 + e)

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Correct Answer - Option 3 : n = e/(1 + e)

Concept:

Void ratio (e):

Void ratio is usually defined as the ratio of the volume of voids to the total volume of soil solid.

Porosity (n):

Porosity is defined as the ratio of the volume of voids to the total volume of the soil.

The relationship between void ratio and porosity are as follows:

\(\rm{e=\frac{n}{1-n}\; and\; n=\frac{e}{1+e}}\)

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