For 10 points, name this reversible property exhibited by certain gels, such as ketchup, that are capable of becoming liquid when disturbed, and return to a semi-solid state upon standing.
Moore and Hahn developed constitutive equations for substances with this property, while Green and Weltman used hysteresis loops to study it. Pronounced in systems containing non-spherical particles, this phenomenon is associated with the Bingham equation and is typically caused by the breakdown of flocs. The term rheopexy is sometimes used to denote the anti form of this property, which can apply to a type of non-Newtonian fluid whose viscosity decreases over time as a result of a constant shear rate. For 10 points, name this reversible property exhibited by certain gels, such as ketchup, that are capable of becoming liquid when disturbed, and return to a semi-solid state upon standing.
Moore and Hahn developed constitutive equations for substances with this property, while Green and Weltman used hysteresis loops to study it.
{thixotropy} [accept word variants, such as {thixotropic}]