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Consider the following statements:
1. The bulk density of metal powder is less than its true density.
2. The sum of the porosity and packing factor is equal to unity.
3. The packing factor for loose metal powders lies between 0.5 and 0.7.
Which of the above statements pertaining to metal powder is/are valid?
  • a)
    3 only
  • b)
    1 and 2 '
  • c)
    2 and 3
  • d)
    1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements:1. The bulk density of metal powder ...
Bulk Density of Metal Powder, Porosity and Packing Factor

Statement 1: The bulk density of metal powder is less than its true density.
- True density is the density of solid particles in the powder.
- Bulk density is the mass of powder divided by its bulk volume (including voids).
- As the powder contains voids, the bulk density is always less than the true density.
- Hence, statement 1 is valid.

Statement 2: The sum of the porosity and packing factor is equal to unity.
- Porosity is the ratio of the volume of voids to the total volume of the powder.
- Packing factor is the ratio of the volume occupied by the particles to the total volume of the powder.
- The sum of porosity and packing factor is equal to unity because the total volume of the powder is the sum of the volume of particles and the volume of voids.
- Hence, statement 2 is valid.

Statement 3: The packing factor for loose metal powders lies between 0.5 and 0.7.
- Packing factor depends on the shape and size of particles, as well as the method of powder preparation.
- For loose metal powders, the packing factor is typically in the range of 0.5 to 0.7.
- This means that only 50% to 70% of the total volume of the powder is occupied by the particles.
- Hence, statement 3 is valid.

Conclusion:
All three statements are valid and true for metal powders.
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Consider the following statements:1. The bulk density of metal powder is less than its true density.2. The sum of the porosity and packing factor is equal to unity.3. The packing factor for loose metal powders lies between 0.5 and 0.7.Which of the above statements pertaining to metal powder is/are valid?a)3 onlyb)1 and 2 c)2 and 3d)1, 2 and 3Correct answer is option 'D'. Can you explain this answer?
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