# What is a Non Newtonian Fluid

Sir Isaac Newton has developed many scientific theories in physics and mathematics. He told the characteristics of normal liquid or fluids and how they behave. Newton pinpointed that they have a constant viscosity or in other words their flow only alters with the change in temperature or pressure. Remember that water turns into gas at 100 ˚C and turns into solid after freezing at 0 ˚C. In the temperature between this, water stays into liquid state and has constant viscosity. Normally liquids with constant viscosity takes on any shape they are poured in. However, some liquids do not pursue this rule and these strange liquids are known as non-Newtonian fluids.

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Non Newtonian Fluids

A fluid whose viscosity is not constant based on applied stress is known as non-Newtonian fluid. Cornstarch dissolved in water is one such example. These fluids can be used to explain and understand physics. They are marvellous substances. On the other hand a Newtonian fluid like water acts normally.

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Stress and strain

Stress is when a force is applied to a substance and the result is strain. In case you apply a hammer on a metal object. On the particular area you will see the result of that stress which is known as strain. In case you apply stress on Newtonian fluids, they won’t resist stress and this is why they do not show any signs of strain. In case you hit water with a hammer, water won’t resist any stress and will show no sign of strain.

For non-Newtonian fluids, if you apply a force or stress, it will get thicker. It acts like solid or even gets runnier as compared to their original state. Remember that when you remove the stress, they will return to their state they were in before.

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Types of non-Newtonian fluids

There are different types of non-Newtonian fluids. Some fluids will turn into solid state more in comparison with other non-Newtonian fluids. On the other hands some of these fluids react on the amount of stress while others react on the length of stress applied.

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Implications

You can use it as body armour. This armour will be in its liquid state so it can move easily. However, when stress is applied, it will turn into solid form. It will be suitable for police and army officials.