Question

The bulk density of the produce having porosity and true density of 40% and \(50 \text{ kg}\cdot\text{m}^{-3}\) will be

• A. \(20 \text{ kg}\cdot\text{m}^{-3}\)
• B. \(40 \text{ kg}\cdot\text{m}^{-3}\)
• C. \(80 \text{ kg}\cdot\text{m}^{-3}\)
• D. \(30 \text{ kg}\cdot\text{m}^{-3}\)

Hint:

To solve this mentally:
If the porosity (void space) is 40%, then the solid space fraction must be 60% (\(100% - 40% = 60%\)).
The bulk density is simply 60% of the true density:
\[ \rho_b = 50 \times 0.60 = 30 \text{ kg}\cdot\text{m}^{-3} \]

Answer 1

The Correct Option is D