Engineering Properties of Grains

The porosity $\epsilon$ of a grain bulk having true particle density $\rho_t$ and bulk density $\rho_b$ is calculated as:

Options:

• (A) $\epsilon = \left(1 - \frac{\rho_b}{\rho_t}\right) \times 100$
• (B) $\epsilon = \frac{\rho_b}{\rho_t} \times 100$
• (C) $\epsilon = \left(1 - \frac{\rho_t}{\rho_b}\right) \times 100$
• (D) $\epsilon = \left(\frac{\rho_t - \rho_b}{\rho_b}\right) \times 100$