What is bulk density and tapped density and compressibility index

Question

Accepted Answer

Bulk density is the mass of a powder per unit volume, while tapped density is the mass of a powder per unit volume after tapping. Compressibility index is a measure of the powder's ability to be compressed.

Bulk density is determined by measuring the mass of a known volume of powder.
Tapped density is determined by measuring the mass of a known volume of powder after tapping it a specified number of times.
Compressibility index is calculated by subtracting the tapped density from the bulk density, dividing the result by the bulk density, and multiplying by 100.
Powders with high compressibility index are difficult to compress, while those with low compressibility index are easy to compress.

Accepted Answer

The bulk density often is the bulk density of the powder “as poured” or as passively filled into a measuring vessel. The tapped density is a limiting density attained after “tapping down,” usually in a device that lifts and drops a volumetric measuring cylinder containing the powder a fixed distance.

What is bulk density and tapped density and compressibility index

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