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more general categories information about this item 20. Product Design and Development 20. Product Design and Development Product Design and Development (23) Specify Fluids, Solids and Semisolids (1) description: Ontomatica's Specify Fluids, Solids and Semisolids Data Application integrates relevant ontology rules (items, properties, relationships and constraints) with relevant data sets. The Specify Fluids, Solids and Semisolids Data Application combines relevant facts to define rheology for a product. Background: Food rheology is the study of the rheological properties of food, that is, the consistency and flow of food under tightly specified conditions. The consistency, degree of fluidity, and other mechanical properties are important in understanding how long food can be stored, how stable it will remain, and in determining food texture. The acceptability of food products to the consumer is often determined by food texture, such as how spreadable and creamy a food product is. Food rheology is important in quality control during food manufacture and processing. Food rheology terms have been noted since ancient times. In ancient Egypt bakers judged the consistency of dough by rolling it in their hands.