{"id":15833,"date":"2024-07-08T07:54:30","date_gmt":"2024-07-08T05:54:30","guid":{"rendered":"https:\/\/www.rct-online.de\/magazin\/?p=15833"},"modified":"2026-01-13T15:53:05","modified_gmt":"2026-01-13T14:53:05","slug":"newtonian-and-non-newtonian-fluids","status":"publish","type":"post","link":"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/","title":{"rendered":"Newtonian and Non-Newtonian Fluids"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/#Definition_of_Newtonian_and_Non-Newtonian_Fluids\" title=\"Definition of Newtonian and Non-Newtonian Fluids\">Definition of Newtonian and Non-Newtonian Fluids<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/#What_Are_Non-Newtonian_Fluids\" title=\"What Are Non-Newtonian Fluids?\">What Are Non-Newtonian Fluids?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/#Properties_of_Non-Newtonian_Fluids\" title=\"Properties of Non-Newtonian Fluids\">Properties of Non-Newtonian Fluids<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/#Examples_of_Non-Newtonian_Fluids_and_Their_Applications\" title=\"Examples of Non-Newtonian Fluids and Their Applications\">Examples of Non-Newtonian Fluids and Their Applications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/#Non-Newtonian_Fluids_with_Shear-Thinning_Behaviour\" title=\"Non-Newtonian Fluids with Shear-Thinning Behaviour\">Non-Newtonian Fluids with Shear-Thinning Behaviour<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/#Non-Newtonian_Fluids_with_Dilatant_Behaviour\" title=\"Non-Newtonian Fluids with Dilatant Behaviour\">Non-Newtonian Fluids with Dilatant Behaviour<\/a><\/li><\/ul><\/nav><\/div>\n<p style=\"text-align: justify;\"><strong>That blood is thicker than water is a common saying, and from a physical perspective it is not incorrect. However, when measured by its viscosity, blood does not behave according to the same rules as water. Instead, it exhibits a discontinuous flow behaviour. This makes this vital fluid a non-Newtonian fluid, in contrast to water, which behaves as an ideally viscous Newtonian fluid. An insight into the world of flowing matter.<\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Definition_of_Newtonian_and_Non-Newtonian_Fluids\"><\/span>Definition of Newtonian and Non-Newtonian Fluids<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Liquids and gases can be divided into two fundamental classes according to their flow behaviour: Newtonian fluids and non-Newtonian fluids. The term goes back to Isaac Newton (1643\u20131727). The English physicist and mathematician described the viscosity of an ideal, or Newtonian, fluid in his law and thus laid the foundation for mathematically describing the behaviour of fluids.<\/p>\n<div class=\"box info  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tA Newtonian fluid is a fluid \u2013 that is, a liquid or a gas \u2013 that exhibits ideally viscous flow behaviour. This means that it always shows the same <a href=\"https:\/\/www.rct-online.de\/magazin\/en\/viscosity-and-viscoelasticity\/\">viscosity<\/a>, regardless of external forces. In addition, a Newtonian fluid has no yield stress, meaning that it flows even under minimal load.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">In Newtonian fluids, the shear rate (also referred to as the rate of deformation) is proportional to the shear stress. The following equation applies and is known as the <strong>Newtonian law<\/strong>:<\/p>\n<p style=\"text-align: center;\">\u03c4 = \u03b7 d<em>u<\/em>\/d<em>y<\/em><\/p>\n<p style=\"text-align: justify;\">\u03b7 is a proportionality constant and is also referred to as the dynamic viscosity. According to this equation, the shear stress \u03c4 depends directly on the shear rate d<em>u<\/em>\/d<em>y<\/em>. Here, <em>u<\/em> is the flow velocity parallel to the wall and <em>y<\/em> is the spatial coordinate perpendicular to the wall.<\/p>\n<figure id=\"attachment_10075\" aria-describedby=\"caption-attachment-10075\" style=\"width: 450px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-10075 size-full\" title=\"Sir Isaac Newton (1643\u20131727) was an English physicist, mathematician and astronomer (painting circa 1689)\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/gemaelde-isaac-newton.jpg\" alt=\"Sir Isaac Newton (1643\u20131727) was an English physicist, mathematician and astronomer (painting circa 1689)\" width=\"450\" height=\"583\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/gemaelde-isaac-newton.jpg 450w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/gemaelde-isaac-newton-232x300.jpg 232w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><figcaption id=\"caption-attachment-10075\" class=\"wp-caption-text\"><center>Sir Isaac Newton (1643\u20131727) was an English physicist, mathematician and astronomer (painting circa 1689)<\/center><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">Such fluids therefore exhibit <strong>linearly viscous flow behaviour<\/strong>, meaning that the viscosity remains constant and independent of the applied load. Newtonian fluids display the simplest type of flow behaviour, and their motion can be described by the Navier\u2013Stokes equations.<\/p>\n<p style=\"text-align: justify;\">Most fluids encountered in everyday life are Newtonian fluids and behave in an ideally viscous manner. Examples include water, air, most solvents and gases, as well as many oils such as mineral oil.<\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"What_Are_Non-Newtonian_Fluids\"><\/span>What Are Non-Newtonian Fluids?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">Rheology, also known as the science of flow, is the field that deals with the behaviour and flow mechanics of non-Newtonian fluids. A non-Newtonian fluid is defined as a fluid that does not exhibit ideal viscous behaviour.<\/p>\n<div class=\"box note  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tThis means that the viscosity of non-Newtonian fluids does not remain constant under externally applied forces but changes with the applied shear forces. These fluids therefore do not follow the Newtonian law and are also referred to as anomalously viscous.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">Non-Newtonian flow behaviour can be attributed to changes in interactions within a fluid at different shear forces. For example, the interactions between particles in a <a href=\"https:\/\/www.rct-online.de\/magazin\/en\/procedure-for-the-separation-of-suspensions\/\">suspension<\/a> or emulsion change as the externally applied force varies, which in turn alters the viscosity of the system. As a result, most dispersions are not ideally viscous.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Properties_of_Non-Newtonian_Fluids\"><\/span>Properties of Non-Newtonian Fluids<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">The viscosity of non-Newtonian fluids may either decrease with increasing shear force, in which case they are referred to as shear-thinning or pseudoplastic, or increase, which is described as dilatant behaviour. Shear-thinning behaviour, i.e. a decrease in viscosity with increasing shear rate, is far more common than dilatant behaviour. Examples of shear-thinning fluids include dispersions and molten polymers. Dilatant or shear-thickening behaviour occurs, among other cases, in starch\u2013water mixtures or wet sand.<\/p>\n<figure id=\"attachment_10078\" aria-describedby=\"caption-attachment-10078\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-10078 size-full\" title=\"Thixotropy and Rheopexy\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/thixotropie-und-rheopexie.jpg\" alt=\"Thixotropy and Rheopexy\" width=\"500\" height=\"353\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/thixotropie-und-rheopexie.jpg 500w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/thixotropie-und-rheopexie-300x212.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-10078\" class=\"wp-caption-text\"><center>Thixotropy and Rheopexy<\/center><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">If the viscosity returns to its original value only with a time delay after a reduction in shear force, this is referred to as thixotropy (delayed increase in viscosity) or rheopexy (delayed decrease in viscosity). After some time, these fluids usually return to their initial viscosity. If this does not occur, the behaviour is described as partial or false thixotropy or rheopexy.<\/p>\n<p style=\"text-align: justify;\">Another distinguishing feature of non-Newtonian fluids is whether they exhibit a yield stress. Fluids with a yield stress are referred to as plastic fluids. These substances initially behave like solids and only begin to flow when stronger shear forces are applied. The transition point from solid to liquid is known as the <strong>yield stress<\/strong>. At a shear rate of zero, the viscosity of these fluids is infinitely high. Semi-solid substances such as ointments or creams exhibit a yield stress and therefore do not behave in an ideally viscous manner.<\/p>\n<p style=\"text-align: justify;\">In the simplest case, a plastic fluid behaves as a solid up to a certain shear force and as a Newtonian fluid above that threshold. Such systems are known as Bingham fluids. Examples include ketchup, mayonnaise, toothpaste, yeast dough and some wall paints.<\/p>\n<p style=\"text-align: justify;\">A Casson fluid is a plastic fluid that becomes capable of flowing above a certain shear stress and subsequently exhibits non-Newtonian properties, as can be observed, for example, in chocolate mass.<\/p>\n<figure id=\"attachment_10081\" aria-describedby=\"caption-attachment-10081\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-10081 size-full\" title=\"Relationship between shear stress and shear rate for different fluids\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/scherspannung-nichtnewtonscher-fluide.jpg\" alt=\"Relationship between shear stress and shear rate for different fluids\" width=\"500\" height=\"350\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/scherspannung-nichtnewtonscher-fluide.jpg 500w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/scherspannung-nichtnewtonscher-fluide-300x210.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-10081\" class=\"wp-caption-text\"><center>Relationship between shear stress and shear rate for different fluids<\/center><\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Examples_of_Non-Newtonian_Fluids_and_Their_Applications\"><\/span>Examples of Non-Newtonian Fluids and Their Applications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">A list of examples of well-known substances with non-Newtonian flow properties:<\/p>\n<ul>\n<li style=\"text-align: justify;\">Most dispersions<\/li>\n<li style=\"text-align: justify;\">Slurries<\/li>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/www.rct-online.de\/en\/filtration\/granulars-and-sorbent-material\">Granulates<\/a><\/li>\n<li style=\"text-align: justify;\">Polymer melts<\/li>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/www.rct-online.de\/en\/adhesives-and-lubricants\/greases\">Lubricants and greases<\/a> such as sliding greases, multipurpose greases and high-temperature PTFE greases<\/li>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/www.rct-online.de\/en\/adhesives-and-lubricants\/sprays\">Sprays<\/a><\/li>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/www.rct-online.de\/en\/adhesives-and-lubricants\/adhesives\">Adhesives<\/a><\/li>\n<li style=\"text-align: justify;\">Blood<\/li>\n<li style=\"text-align: justify;\">Ointments and creams<\/li>\n<li style=\"text-align: justify;\">Doughs and starch\u2013water mixtures<\/li>\n<li style=\"text-align: justify;\">Ketchup, mayonnaise, pudding<\/li>\n<li style=\"text-align: justify;\">Glycerine<\/li>\n<li style=\"text-align: justify;\">Cement slurries<\/li>\n<li>Quicksand<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/adhesives-and-lubricants\/greases\/30361\/ptfe-slip-grease\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-10087 size-medium\" title=\"PTFE Slip Grease\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/ptfe-gleitfett-300x300.jpg\" alt=\"PTFE Slip Grease\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/ptfe-gleitfett-300x300.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/ptfe-gleitfett-150x150.jpg 150w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/ptfe-gleitfett.jpg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>\u00a0<a href=\"https:\/\/www.rct-online.de\/en\/adhesives-and-lubricants\/adhesives\/one-component-adhesives\/30367\/silicone-rubber-adhesive\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-10088 size-medium\" title=\"Silicone Rubber Adhesive\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/kleber-fuer-silikon-kautschuk-300x300.jpg\" alt=\"Silicone Rubber Adhesive\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/kleber-fuer-silikon-kautschuk-300x300.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/kleber-fuer-silikon-kautschuk-150x150.jpg 150w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/kleber-fuer-silikon-kautschuk.jpg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Non-Newtonian_Fluids_with_Shear-Thinning_Behaviour\"><\/span>Non-Newtonian Fluids with Shear-Thinning Behaviour<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">A well-known shear-thinning fluid with a yield stress is wall paint. It adheres to the roller as an elastic solid and only liquefies when the shear forces generated by pressing the roller against the wall become large enough to exceed the yield stress.<\/p>\n<p style=\"text-align: justify;\">Ketchup liquefies when force is applied, for example by shaking, tapping or stirring, and then becomes flowable. When at rest, however, it quickly returns to its original state. It therefore exhibits thixotropic flow behaviour.<\/p>\n<div class=\"box success  \"><div class=\"box-inner-block\"><i class=\"fa tie-shortcode-boxicon\"><\/i>\n\t\t\tThe non-Newtonian properties of blood are important because blood becomes increasingly less viscous as pressure increases, allowing it to flow even through very narrow vessels. High shear forces cause red blood cells to elongate, which improves flowability.\n\t\t\t<\/div><\/div>\n<p style=\"text-align: justify;\">As early as the Middle Ages, a blood-like fluid with non-Newtonian behaviour was produced. This was achieved by mixing iron(III) chloride and calcium carbonate, in the form of crushed eggshells, with water. The resulting mixture is initially a reddish-brown gel, but turns into a blood-red liquid when shaken. When left to stand, it reverts to a gel. This process can be repeated indefinitely. This thixotropic effect is thought to be the basis of so-called \u201cblood miracles\u201d, such as that of Saint Januarius of Naples.<\/p>\n<figure id=\"attachment_10085\" aria-describedby=\"caption-attachment-10085\" style=\"width: 450px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-10085 size-full\" title=\"Shaking, tapping or stirring: ketchup liquefies under applied force\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/ketchup-flasche.jpg\" alt=\"Shaking, tapping or stirring: ketchup liquefies under applied force\" width=\"450\" height=\"328\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/ketchup-flasche.jpg 450w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/ketchup-flasche-300x219.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><figcaption id=\"caption-attachment-10085\" class=\"wp-caption-text\"><center>Shaking, tapping or stirring: ketchup liquefies under applied force<\/center><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">The shear-thinning behaviour of polymers in solutions and melts is of particular technical importance. The polymer chains are entangled with one another, and at higher shear pressures these entanglements are released, causing the viscosity to decrease. As a result, thin-walled injection-moulded parts made from thermoplastics can be produced with lower pressure than thick-walled components.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Non-Newtonian_Fluids_with_Dilatant_Behaviour\"><\/span>Non-Newtonian Fluids with Dilatant Behaviour<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\">When starch is mixed with water, the mixture initially remains liquid when stirred slowly. With more vigorous stirring, it forms an increasingly thick paste that can eventually become crumbly. These crumbs, however, quickly become liquid again and rejoin the rest of the paste (rheopexy).<\/p>\n<p style=\"text-align: justify;\">A similar behaviour can be observed with quicksand, which has a low viscosity during slow movements. If an attempt is made to pull out a submerged object quickly, the viscosity increases and it becomes impossible to remove it from the quicksand. This occurs because stronger forces squeeze the water out of the sand\u2013water mixture, leaving behind sand particles with a much higher viscosity.<\/p>\n<p style=\"text-align: justify;\">Dry sand also exhibits rheopectic properties. Example: a rod is placed in a bucket, which is then filled with dry sand. Tapping the bucket compacts the sand. If an attempt is then made to pull the rod upward, shear forces act on the sand and the grains interlock. The bucket can now be lifted. After some time, however, the sand grains loosen again and can slide past one another, the rod comes free and the bucket falls down.<\/p>\n<p><a href=\"https:\/\/www.rct-online.de\/en\/filtration\/granulars-and-sorbent-material\/30877\/molecular-sieve-sorbent-material-4-aa\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-10090 size-medium\" title=\"Molecular Sieve Sorbent Material 4 \u00c5\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/molekularsieb-sorbentien1-300x195.jpg\" alt=\"Molecular Sieve Sorbent Material 4 \u00c5\" width=\"300\" height=\"195\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/molekularsieb-sorbentien1-300x195.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/molekularsieb-sorbentien1.jpg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>\u00a0<a href=\"https:\/\/www.rct-online.de\/en\/filtration\/granulars-and-sorbent-material\/31201\/activated-carbon-granular-sorbent-material-based-on-cocnut\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-10091 size-medium\" title=\"Activated Carbon Granular Sorbent Material based on coconut\" src=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/aktivkohle-granulat-300x195.jpg\" alt=\"Activated Carbon Granular Sorbent Material based on coconut\" width=\"300\" height=\"195\" srcset=\"https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/aktivkohle-granulat-300x195.jpg 300w, https:\/\/www.rct-online.de\/magazin\/wp-content\/uploads\/2025\/07\/aktivkohle-granulat.jpg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Commercial products that make use of dilatant properties include, for example, bouncing putty or \u201cActive Protective System\u201d (APS) inserts in protective clothing. Bouncing putty becomes solid under strong pressure, such as when thrown onto the ground, and rebounds in a rubber-like manner. It can also be torn and shattered. When left undisturbed for some time, however, it flows like a viscous liquid. APS inserts are used in motorcycle clothing and consist of pads with dilatant mixtures that do not restrict mobility. In the event of sudden force, such as during a fall, the material hardens and the forces are distributed over a larger body surface.<\/p>\n<pre><strong>Image Sources:<\/strong>\r\nCover image | \u00a9 vittaliya \u2013 stock.adobe.com\r\nPainting of Sir Isaac Newton | \u00a9 James Thronill after Sir Godfrey Kneller, Public domain, via Wikimedia Commons\r\nGraphic: Thixotropy and Rheopexy | \u00a9 David Spura, CC BY-SA 3.0 &lt;https:\/\/creativecommons.org\/licenses\/by-sa\/3.0&gt;, via Wikimedia Commons\r\nGraphic: Shear stress and shear rate | \u00a9 Dietmar Haba, CC BY-SA 3.0 &lt;https:\/\/creativecommons.org\/licenses\/by-sa\/3.0&gt;, via Wikimedia Commons\r\nKetchup bottle pouring | \u00a9 New Africa \u2013 stock.adobe.com<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>That blood is thicker than water is a common saying, and from a physical perspective it is not incorrect. However, when measured by its viscosity, blood does not behave according to the same rules as water. Instead, it exhibits a discontinuous flow behaviour. This makes this vital fluid a non-Newtonian fluid, in contrast to water, &hellip;<\/p>\n","protected":false},"author":14,"featured_media":13530,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2744],"tags":[3777],"class_list":["post-15833","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-all-articles","category-chemical-technology-in-action","tag-newtonian-fluids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Newtonian and Non-Newtonian Fluids - Reichelt Chemietechnik Magazine<\/title>\n<meta name=\"description\" content=\"What Are Newtonian &amp; Non-Newtonian Fluids?How Can Flow Behaviour Be Explained Physically?\u2705 Examples\u2705 Applications\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rct-online.de\/magazin\/en\/newtonian-and-non-newtonian-fluids\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Newtonian and Non-Newtonian Fluids - Reichelt Chemietechnik Magazine\" \/>\n<meta property=\"og:description\" content=\"What Are Newtonian &amp; 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