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General and theory
Introduction
Important properties of lactose as a crystalline powder material are related to the fineness or coarseness of the powder, or even to the ratio of fine and coarse particles in a powder.
In a given powder, coarser and finer particles co-exist . In fact, each powder consists of a collection of particles of a range of different sizes. In other words: a powder has a particle size distribution.
How is the coarseness or fineness of a powder expressed? How is this property measured and how is it related to the given particle size distribution? Can the particle size distribution (PSD) itself be measured? How can lactose powders of different fineness and with different PSDs be compared unambiguously? This section presents some basic answers to these questions.
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