Apparent density (ρa) is the relationship between the mass and volume of the material, including pores and water content.
The apparent density (ρa) is calculated by = weight of the sample ÷ V (bulk)
True density (ρ) is the mass of a particle divided by its volume, without considering pores in the material (excluding open and closed pores).
The true density (ρ) is calculated expressed by = weight of the sample ÷ V (true)
The bulkiness (B) is the reciprocal of the apparent density.
Therefore, B = 1/ Apparent density (ρa)
Example
A selected powder has a true density (ρ) of 3.5 g/cc. Experimentally, 2.5 g of the powder measures 40 mL in a cylindrical graduate. Calculate the apparent density and bulkiness.
We know that,
Apparent density (ρa) = weight of the sample ÷ V (bulk) = 2.5 ÷ 40 = 0.0625 g/ml
We know also,
Bulkiness = = 1/ Apparent density (ρa) = 1/0.0625 = 16 ml/g.
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