Rheology Rheology is a widely known analytical technique that is used in studying the viscosity, modulus, and shear parameters of various systems. Several definitions and key relationships need to be discussed in order to understand how the rheological measurements were interpreted. Rheology is defined as the study of the flow and The CGS unit is the poise (P, or g·cm −1 ·s −1 = 0.1 Pa·s), named after Jean Léonard Marie Poiseuille. It is commonly expressed, particularly in ASTM standards, as centipoise (cP), because it is more convenient (for instance the viscosity of water at 20°C is about 1 cP), and one centipoise is equal to the SI millipascal second (mPa·s).
What is Rheology ? Rheology is "the deformation science of materials". It is the study of how materials such as honey, dough, polymers and blood flow under an applied stress or pressure. Example. Below is a snapshot of a composite of fibers and a polymer that is heated to 300C and squeezed between two parallel plates by applying a force.