Its viscosity becomes lower as force is applied. For example, ketchup flows out of the tube when it is pressed. Examples of thixotropic materials are lotions, gels, ketchup, paints, and gypsum. It means the change or transition of a substance due to mechanical load iv. Thixotropy is a time-dependent phenomenon, as the viscosity of the substance must recover after a certain period of time when the applied force is removed iii.The term thixotropy consists of the Greek words 'thixis' (to touch) and 'trepein' (to turn). The higher the force that is applied, the lower the viscosity becomes.
Thixotropy is the property of certain fluids and gels of becoming thinner when a constant force is applied and after reduction of the force the viscosity recovers fully to the initial state in an appropriate period of time i-ii.
