Question

The porosity $\left(n\right)$ and the degree of saturation $\left(S\right)$ of a soil sample are 0.7 and 40%, respectively. In a 100 $m^3$ volume of the soil, the volume $\left(expressedin{m}^3\right)$ of air is

• A. 42

Answer 1

The correct option is A 42
$Porosity=n=\frac{V_v}{V}=0.7$

$V_v=0.7\times 100=70m^3$

$\frac{V_w}{V_v}=S=0.4$

$V_w=70\times 0.4=28$

$V_a=V_v-V_w=70-28=42m^3$

$Volumeofair=42m^3$