An increase in volume of the system which usually accompanies shear thickening. This term has formerly been used for the phenomenon of shear thickening.
PAC, 1979, 51, 1213. 'Terminology and Symbols in Colloid and Surface Chemistry Part 1.13. Definitions, Terminology and Symbols for Rheological Properties' on page 1217 (https://doi.org/10.1351/pac197951051213)