Question Bank • QB_APE_EXP_056 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Engineering Properties of Agriculture Produce

Subtopic: Physical properties

Question Statement:

A bulk paddy sample has a bulk density of $580\text{ kg/m}^3$ and a true particle density of $1320\text{ kg/m}^3$. Calculate the porosity of the bulk paddy bed in percentage.

Answer Key:

56.06

Step-by-Step Solution & Explanation

Porosity $\epsilon$ of a granular bed is given by: $\epsilon = \left(1 - \frac{\rho_b}{\rho_t}\right) \times 100$ Where: - Bulk density $\rho_b = 580\text{ kg/m}^3$ - True density $\rho_t = 1320\text{ kg/m}^3$ $\epsilon = \left(1 - \frac{580}{1320}\right) \times 100 = (1 - 0.43939) \times 100 = 56.06\%$
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