**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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