Applying a force has no effect on the viscosity. Honey, whether it’s warm or cold, is a good example of a Newtonian fluid.

Water, air, alcohol, glycerol, and thin motor oil are all examples of Newtonian fluids over the range of shear stresses and shear rates encountered in everyday life. Single-phase fluids made up of small molecules are generally (although not exclusively) Newtonian.

In reality most fluids are non-Newtonian, which means that their viscosity is dependent on shear rate (Shear Thinning or Thickening) or the deformation history (Thixotropic fluids).

Mayonnaise is a common non-Newtonian fluid, comprised of eggs emulsified into oil, the host fluid. Because mayonnaise is non-Newtonian, its viscosity yields with applied force, making it easy to spread.

Newtonian fluids have a constant viscosity that doesn’t change, no matter the pressure being applied to the fluid. Non-Newtonian fluids are just the opposite — if enough force is applied to these fluids, their viscosity will change.

Created by the Moratex Institute of Security Technologies, the liquid is what’s known as a non-Newtonian fluid. The institute is being tight-lipped on what exactly their fluid is made of, but they revealed that when fitted in a vest, it’s capable of stopping bullets fired at 450 metres (or 1,400 feet) per second.

If you’ve ever wondered why you must suffer at the hands of this stubborn condiment, there is an answer: Tomato sauce is a non-Newtonian fluid. Non-Newtonian Fluids, on the other hand, have different viscosities depending on external forces. Their ability to flow is dependent on shear rate.

Like molten lava, ketchup and oobleck, liquid chocolate is a non-Newtonian fluid that flows differently than substances like water and some kinds of motor oil.

Non-Newtonian fluids on the other hand, do not behave in a linear fashion. They may become thinner or thicker in viscosity, meaning their behavior changes as force is applied or over time (non-linear). Examples of non-Newtonian fluids include ketchup, whipped cream, mayonaisse, and more.

However, some special liquids— such as ketchup, sour cream, toothpaste, custard, honey—sometimes act like a solid and sometimes act like a liquid. These are known as non-Newtonian fluids.

Add ¼ cup of dry cornstarch to the bowl. Add about 1/8 cup (2 tablespoons, or 30 cm3) of water to the corn starch and stir slowly. Add water slowly to the mixture, with stirring, until all of the powder is wet. Continue to add water until the cornstarch acts like a liquid when you stir it slowly.

Custard, quicksand, ketchup and emulsion paint are non-Newtonian liquids. In the custard the energy of the impact causes the starch to act more like a solid than a liquid. This means in theory you can walk on a swimming pool of custard… or given BBC budgets jump up and down on a small bucket of it!

Custard is a weak gel, viscous and thixotropic. Being a non-Newtonian liquid, it changes its viscosity under stress.

When you move the custard mix around slowly the custard powder particles can move around in the water quite freely, and so it acts as aliquid. When you move the mix faster or hold it in your hand tightly, the solid particles rub against each other causing friction. This makes them stick together and act like a solid.

Custard

Types of custard Generally based on milk solids and starch, there are three main varieties of refrigerated custard: premium, regular and low-fat.

Because Custard Powder has no eggs in it, there is no danger of it curdling on you as real custard can.

Custard is a delicious addition to any winter pudding. With milk as the main ingredient, custard is a good source of protein and contains calcium, which is good for bone health. But custard is a treat food because it can also give us extra energy, fat and sugar that we maybe don’t want, or need.

Since custard apple is moisture-rich with hydrating capabilities and properties, it is an extremely cooling fruit. Ayurvedic texts, in fact, suggest that consuming custard apple can help bring down the body’s temperature, which means people with excess body heat can benefit from it.