Tell about bulk density and tap density and compressibility index

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Bulk density is the mass of a unit volume of a material in its natural state, while tap density is the mass of a unit volume of a material after tapping or vibrating. Compressibility index indicates the ability of a powder to decrease in volume under pressure.

Bulk density is measured by dividing the mass of the material by its volume, typically expressed in g/cm^3.
Tap density is determined by measuring the volume occupied by a powder after tapping or vibrating it in a graduated cylinder.
Compressibility index is calculated as (Tapped density - Bulk density) / Tapped density * 100% and indicates the powder's ability to decrease in volume under pressure.
For example, pharmaceutical companies use these parameters to ensure the quality and consistency of their powder formulations.

Tell about bulk density and tap density and compressibility index

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