👉 The Johnson fluid, also known as Johnson's oil, is a viscous, non-Newtonian fluid that exhibits shear-thinning behavior. This means that when subjected to stress, such as stirring or pumping, its viscosity decreases, allowing it to flow more easily. In its resting state, the fluid appears solid or semi-solid due to its high viscosity. However, when agitated, it transitions into a liquid-like state, significantly reducing its thickness and viscosity. This unique property makes the Johnson fluid useful in various industrial applications, such as in drilling fluids, where it helps to reduce friction and enhance fluidity under varying pressures.