IPA: /ˌriːəˈlɒdʒɪkəl/
KK: /riˈoʊlədʒɪkəl/
Relating to the study of how materials flow and deform under stress.
The rheological properties of the fluid determine how it will behave in different conditions.
Rheological → It is formed from "rheo-" (from Greek "rheo", meaning to flow) and "-logical" (from Greek "logia", meaning study or science). The word "rheological" refers to the study of the flow of matter, particularly in the context of materials and their deformation under stress.
Think of 'flow' ('rheo-') when remembering that 'rheological' relates to the study of how materials flow and deform.