Rheology is used to describe and assess the deformation and flow behavior of materials. Fluids flow at different speeds and solids can be deformed to a certain extent. Oil, honey, shampoo, hand cream, toothpaste, sweet jelly, plastic materials, wood, and metals – depending on their physical behavior, you can put them in order: On the one side liquids, on the other side solids, and in between highly viscous, semi-solid substances.

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