Rheology (; from
Greek ῥέω
rhéō, "flow" and -λoγία, -
logia, "study of") is the study of the flow of matter, primarily in a liquid state, but also as 'soft solids' or solids under conditions in which they respond with plastic flow rather than deforming elastically in response to an applied force. It applies to substances which have a complex microstructure, such as
muds,
sludges,
suspensions,
polymers and other
glass formers (
e.g., silicates), as well as many foods and additives,
bodily fluids (
e.g., blood) and other biological materials or other materials which belong to the class of
soft matter.