Rheology
Rheology
Rheology (pronounced: ree-ol-uh-jee) is a branch of physics that deals with the deformation and flow of matter, especially the non-Newtonian flow of liquids and the plastic flow of solids. The term comes from the Greek words "rheo" meaning "to flow" and "logia" meaning "study of".
Etymology
The term "Rheology" was coined by Eugene C. Bingham, a chemist, and Markus Reiner, a physicist, in the 1920s. The word is derived from the Greek "rheos" which means "stream", and "-logy" which means "the study of".
Related Terms
- Viscosity: A measure of a fluid's resistance to flow. It describes the internal friction of a moving fluid. A fluid with large viscosity resists motion because its molecular makeup gives it a lot of internal friction.
- Elasticity: The ability of a material to return to its original shape after being stretched or deformed. Elasticity is a property of materials that allows them to recover their shape after being deformed.
- Plasticity: The property of a material that allows it to be deformed repeatedly without rupture by the action of a force, and to remain deformed after the removal of force.
- Non-Newtonian Fluid: A fluid that does not follow Newton's law of viscosity. The viscosity of non-Newtonian fluids is dependent on shear rate or shear rate history.
- Newtonian Fluid: A fluid that follows Newton's law of viscosity. The viscosity of Newtonian fluids is constant regardless of the shear rate.
See Also
External links
- Medical encyclopedia article on Rheology
- Wikipedia's article - Rheology
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