Non-Newtonian Fluid - Wikipedia - tensile stresses  ## Metadata - Author: **tensile stresses** - Full Title: Non-Newtonian Fluid - Wikipedia - Category: #articles - URL: https://en.wikipedia.org/wiki/Non-Newtonian_fluid#:~:text=A%20non%2DNewtonian%20fluid%20is,thus%20a%20non%2DNewtonian%20fluid. ## Highlights - A non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid. Many salt solutions and molten polymers are non-Newtonian fluids, as are many commonly found substances such as custard,[1] toothpaste, starch suspensions, corn starch, paint, blood, melted butter, and shampoo.