A soil having bulk density of 1.3 and particle density of 2.65, then the percentage of pore space will be

Answer: Option A

A soil having Bulk density = 1.3
article density = 2.65
The space between the soil particles in the pore space.
The formulas for calculating the pore space percentage: $$\text{PS}=\left(1-\frac{\text{BD}}{\text{PD}}\right)\times 100$$
Where PS is Pore Space, BD is Bulk Density and PD is Particle Density.
Putting all the values in the above formula
$$\begin{array}{rl}& \text{PS}=\left(1-\frac{1.3}{2.65}\right)\times 100\\ & =0.5094\times 100\\ & =50.94\end{array}$$