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Pharmaceutical Manufacturing Handbook: Production and

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1178 EFFECTS OF GRINDING IN PHARMACEUTICAL TABLET PRODUCTION<br />

TABLE 4<br />

Density<br />

Types<br />

Absolute<br />

powder<br />

density<br />

Apparent<br />

particle<br />

density<br />

Apparent<br />

powder<br />

density<br />

Bulk<br />

density<br />

Effective<br />

particle<br />

density<br />

Envelope<br />

density<br />

Skeletal<br />

density<br />

Tap<br />

density<br />

True<br />

density<br />

Defi nitions of Density Terms<br />

Density Defi nitions<br />

Mass of powder per unit of<br />

absolute volume, which is<br />

defi ned as the solid matter<br />

after exclusion of all the<br />

spaces (pores <strong>and</strong> voids)<br />

(BSI)<br />

Mass of particles divided by its<br />

apparent particle volume,<br />

which is defi ned as the total<br />

volume of the particle,<br />

excluding open pores but<br />

including closed pores (BSI)<br />

Mass of powder divided by its<br />

apparent powder volume,<br />

which is defi ned as the total<br />

volume of solid matter,<br />

including open pores <strong>and</strong><br />

closed pores <strong>and</strong> interstices<br />

(BSI)<br />

Mass of the particles divided<br />

by the volume they occupy,<br />

which includes the space<br />

between the particles<br />

(ASTM)<br />

Mass of a particle divided by<br />

its volume, including open<br />

pores <strong>and</strong> closed pores (BSI)<br />

Ratio of the mass of a particle<br />

to the sum of the volumes of<br />

the solid in each piece <strong>and</strong><br />

voids within each piece,<br />

which is, within close - fi tting<br />

imaginary envelopes,<br />

completely surrounding each<br />

piece (ASTM)<br />

Ratio of the mass of discrete<br />

pieces of solid material to<br />

the sum of the volumes of<br />

the solid material in the<br />

pieces <strong>and</strong> closed pores<br />

within the pieces (ASTM)<br />

Apparent powder density<br />

obtained under stated<br />

conditions of tapping (BSI)<br />

Mass of a particle divided by<br />

its volume, excluding open<br />

pores <strong>and</strong> closed pores (BSI)<br />

Solid<br />

Material<br />

Volume<br />

Volumes in Defi nition<br />

Closed -<br />

Pore<br />

Volume<br />

Open -<br />

Pore<br />

Volume<br />

Interparticle<br />

Void<br />

Volume<br />

� � � �<br />

� � � �<br />

� � � �<br />

� � � �<br />

� � � �<br />

� � � �<br />

� � � �<br />

� � � �<br />

� � � �<br />

Note: BSI = British St<strong>and</strong>ards Institute [16] , ASTM = American Society for Testing <strong>and</strong> Material [17] .<br />

� , included; � , excluded.

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