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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.
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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
Shear stress in solids results from actions such as twisting...
- Deformation
For comparison, the viscosity of glycerine (a viscous fluid)...
- Kinematic Viscosity
Oct 5, 2023 · Examples are water, mineral oil, alcohol, and gasoline. On the other hand, if the viscosity does not remain constant and depends on the force applied, the fluid is called non-Newtonian fluid. The viscosity changes as shear stress is applied. Examples include slime, toothpaste, cosmetics, and paints.
- 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 23, 2022 · Liquids which flow very slowly, like glycerin or honey, have high viscosities. Those like ether or gasoline which flow very readily have low viscosities. Viscosity is governed by the strength of intermolecular forces and especially by the shapes of the molecules of a liquid.
Viscosity is a measure of a fluid’s resistance to flow. The SI unit of viscosity is poiseiulle (PI). Its other units are newton-second per square metre (N s m -2) or pascal-second (Pa s.) The dimensional formula of viscosity is [ML -1 T -1].
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- Viscosity does not change as the amount of matter changes, therefore it is an intensive property.
- The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature.
- As the viscosity increases, the flow rate decreases. The flow rate is inversely proportional to viscosity.
- Kinematic viscosity is a measure of a fluid’s internal resistance to flow under gravitational forces.
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.
Viscosity is an essential physical property in science and engineering, and it plays a crucial role in many processes, such as mixing, pumping, and transport. Understanding viscosity is important in various fields, including fluid mechanics, materials science, food science, and medicine.
