A non-Newtonian fluid
is a fluid with properties that make it behave differently from more conventional Newtonian fluids, described by the classical laws of fluid dynamics. Specifically, a non-Newtonian fluid is one which does not have a constant coefficient of viscosity
, perhaps being dependent on the presence of a magnetic field (called magnetorheological fluids
) or the physical pressure being exerted (such as the fun science project nicknamed Oobleck
) or time-dependent in some way.