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- viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Molasses, for example, has a greater viscosity than water.
www.britannica.com/science/viscosity
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Sep 17, 2024 · viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Molasses, for example, has a greater viscosity than water.
- Kinematic Viscosity
Other articles where kinematic viscosity is discussed:...
- Dynamic Viscosity
Other articles where dynamic viscosity is discussed:...
- Pascal
Pascal, unit of pressure and stress in the International...
- Coefficient of Viscosity
Other articles where coefficient of viscosity is discussed:...
- Bulk Viscosity
Other articles where bulk viscosity is discussed: fluid...
- Superfluidity
Superfluidity, the frictionless flow and other exotic...
- Stress
Stress, in physical sciences and engineering, force per unit...
- Deformation
Deformation and flow, in physics, alteration in shape or...
- Kinematic Viscosity
Oct 5, 2023 · Viscosity is a physical quantity that describes a fluid’s resistance to flow. It is a property that resists the relative displacement of the different layers of the fluid. It can be considered as the fluid friction occurring inside the fluid due to the internal friction between the molecules.
Jun 23, 2022 · Viscosity is a fluids resistance to flow. This page details why certain liquids flow easily while others are slow as molasses.
- Viscosity Units
- How Viscosity Works
- Dynamic Viscosity vs Kinematic Viscosity
- Viscosity of Water
- Newtonian and Non-Newtonian Fluids
- Measuring Viscosity
- References
The SI unit for viscosity is newton-second per square meter (N·s/m2). However, you’ll often see viscosity expressed in terms of pascal-second (Pa·s), kilogram per meter per second (kg·m−1·s−1), poise (P or g·cm−1·s−1= 0.1 Pa·s) or centipoise (cP). This makes the viscosity of water at 20 °C about 1 cP or 1 mPa·s. In American and British engineering,...
Viscosity is friction between fluid molecules. As with friction between solids, higher viscosity means it takes more energy to make a fluid flow. When you pour a liquid from a container, there is friction between the container wall and the molecules. Basically, these molecules stick to the surface to a greater or lesser degree. Meanwhile, molecules...
There are two ways to report viscosity. Absolute or dynamic viscosity is a measure of a fluid’s resistance to flow while kinematic viscosityis the ratio of dynamic viscosity to a fluid’s density. While the relationship is straightforward, it’s important to remember two fluids with the same dynamic viscosity values may have different densities and t...
The dynamic viscosity of water is 1.0016 millipascals⋅second or 1.0 centipoise (cP) at 20 °C. Its kinematic viscosity is 1.0023 cSt, 1.0023×10-6 m2/s, or 1.0789×10-5 ft2/s. Liquid water viscosity decreases as temperature increases. The effect is fairly dramatic. For example, water’s viscosity at 80 °C is 0.354 millipascals⋅second. On the other hand...
Newton’s law of frictionis an important equation relating to viscosity. τ = μ dc / dy = μ γ where τ = shearing stress in fluid (N/m2) μ = dynamic viscosity of fluid (N s/m2) dc = unit velocity (m/s) dy = unit distance between layers (m) γ = dc / dy = shear rate (s-1) Rearranging the terms, gives the formula for dynamic viscosity: μ = τ dy / dc = τ ...
Instruments for measuring viscosity are viscometers and rheometers. Technically, a rheometer is a special type of viscometer. The devices either measure the flow of a fluid past a stationary object or else the movement of an object through a fluid. The viscosity value is the drag between the fluid and the object surface. These devices work when the...
Assael, M. J.; et al. (2018). “Reference Values and Reference Correlations for the Thermal Conductivity and Viscosity of Fluids”. Journal of Physical and Chemical Reference Data. 47 (2): 021501. do...Balescu, Radu (1975). Equilibrium and Non-Equilibrium Statistical Mechanics. John Wiley & Sons. ISBN 978-0-471-04600-4.Bird, R. Bryon; Armstrong, Robert C.; Hassager, Ole (1987). Dynamics of Polymeric Liquids, Volume 1: Fluid Mechanics(2nd ed.). John Wiley & Sons.Cramer, M. S. (2012). “Numerical estimates for the bulk viscosity of ideal gases”. Physics of Fluids. 24 (6): 066102–066102–23. doi:10.1063/1.4729611Jun 26, 2023 · Viscosity is a fluids resistance to flow. This page details why certain liquids flow easily while others are slow as molasses.
Jan 30, 2023 · Viscosity can be not only a fluid’s resistance to flow but also a gas’ resistance to flow, change shape or movement. The opposite of viscosity is fluidity which measures the ease of flow while liquids such as motor oil or honey which are “sluggish” and high in viscosity are known as viscous.
Nov 3, 2021 · Viscosity is the tendency of fluids, in either liquid or gas form, to resist forces that act against them. For example, if you tried to rapidly stir pure water while rapidly stirring molasses, you would find it much more difficult to stir the latter. With this in mind, viscosity can also refer to how thick a fluid is.
