What is a viscous fluid? (with photo)

Molasses is a viscous fluid.

A viscous fluid is one that resists the motion or motion of an object through the fluid. All fluids, liquids, gases or plasma, have some measure of viscosity that can be compared using mathematical formulas or direct measurements of motion. Although all fluids have viscosity, a viscous fluid, in the common sense of the term, is one that has a high level of viscosity. These types of fluid can move slowly or not at all, depending on how viscous they are.

In general, liquids measure between 1 and 1000 millipascal seconds, which is a common measure of viscosity. Gases have much lower viscosity measurements between 0.001 and 0.01 millipascal seconds. At sea level and at room temperature, water measures about 1 millipascal of a second. This measurement is of pressure, tensile strength, and motion and indicates the extent to which a fluid resists motion. A more viscous fluid will have a higher value in terms of millipascal seconds, while a less viscous fluid will have a lower value.

The type of matter a fluid is made of is the main determinant of how viscous it is, although other factors, including temperature, also affect viscosity. In general, liquids will become less viscous with increasing temperature, while gases will become more viscous with increasing temperature. Gases become more viscous when they are heated because the atoms in the gas move faster as the temperature rises, resulting in more collisions between atoms and therefore more resistance. Pressure can also affect viscosity, although this is not usually seen in liquids because, unlike gaseous matter, liquid matter is very difficult to compress.

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A substance that would be called a viscous fluid resists motion to some extent. This means that the fluid does not flow or flows very slowly when a force such as gravity is applied to it. It also means that it resists the movement of an object through it.

An extremely viscous fluid can have properties that make it behave more like a solid than a liquid. Butter is an example of a fluid with a high viscosity. Although butter flows at room temperature, it is so resistant to movement that it is difficult to perceive it as a fluid. Heating the butter will make it less viscous. Glass is also a liquid. When glass cools and hardens into a solid state, its viscosity approaches infinity, which means it no longer flows.

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