Since many foods, spices and flavourings are prepared or used in a finely divided powder form, it is hardly surprising that the study of particle size distribution has been important to the food processing industry. The appreciation of small, young, early peas as the most flavoursome, has been instilled in many people since childhood. Whilst the final appreciation of this vegetable depends upon many other factors, size is a key issue. Another catch phrase ‘graded grains make finer flour’ implies that both before and after milling, grain and particle size are considered. The direct sales of apples and eggs are classified by size and priced accordingly. This introduces the concept of a premium price for products of the ‘correct size’. In general any quality product is a graded product, which fulfils a spectrum of requirements of the customer.
KeywordsParticle Size Distribution Brownian Motion Zeta Potential Single Scattering Irregular Particle
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