![]() A dilatant fluid can easily be made by making a 2:1 mixture of cornflour and water. For example at a beach, if you stand on the wet sand, your feet will sink in slightly, but if you run across the sand (thus applying greater stress to it), it will behave as a solid and your feet will not sink in. There are not as many natural dilatants, although certain proportions of sand and water mixed together can display dilatant properties. ![]() Another example of a pseudoplastic is ketchup, which will not flow until it is squeezed or shaken. At first it seems solid but as the victim walks onto it, thereby applying stress and causing it to become more viscous (as quicksand is a pseudoplastic), they sink in as they struggle, applying more stress to the quicksand, which then thins causes them to sink faster. A famous example of a non-Newtonian fluid is quicksand. There are also such things as shear thinning fluids, or pseudoplastics, which display the opposite properties of dilatant materials as more stress is applied to pseudoplastics the viscosity decreases (or shear rate increases) ,Ī number of non-Newtonian fluids can be found naturally, although most of them are pseudoplastics as opposed to dilatants. ![]() This means that some dilatant fluids have the unique property of being able to turn from liquid to a solid just by having stress applied. They are an example of non-Newtonian fluids, as they do not have a linear shear stress versus shear rate rate, which is unique to Newtonian fluids (see graph). Dilatant fluids, also known as shear thickening fluids, are liquids or solutions whose viscosity increases as stress is applied.
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