Kinematic Viscosity
Kinematic Viscosity - Related Videos
08:04
Viscosity of Propylene Glycol Solutions
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Viscosity is a measure of a fluid's resistance to flow, and it is a useful parameter in the design of efficient product processing and quality control in a wide range of industries. A variety of viscometers are used to obtain the most accurate readings of experimental materials. The standard method of measuring viscosity is through a glass tube viscometer, which...
01:17
Viscosity
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2023
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup. The SI unit of viscosity is...
01:27
Viscosity
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2026
Viscosity is a property of fluids that measures their resistance to flow. It is influenced by factors such as the surface area of contact, the gradient of flow speed, and the fluid's viscosity constant, called the coefficient of viscosity. The coefficient of viscosity, also known as dynamic viscosity, is denoted by the symbol η. It determines the proportionality between the viscous force and the gradient of flow speed.Newton's law of viscosity states that the viscous force on a faster-moving...
11:41
Kinematics and Projectile Motion
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2023
Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA This experiment demonstrates the kinematics of motion in 1 and 2 dimensions. This lab will begin by studying motion in 1 dimension, under constant acceleration, by launching a projectile directly upward and measuring the maximum height reached. This lab will verify that the maximum height reached is consistent with the kinematic...
02:57
Surface Tension, Capillary Action, and Viscosity
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2020
Surface Tension The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
FAQs
Density provides the mass basis that distinguishes kinematic viscosity from dynamic viscosity alone. Through the division by density, a fluid with a given dynamic viscosity can have a different kinematic viscosity if its density changes. That distinction matters when engineers use the value to represent momentum diffusion in flow calculations, because the fluid’s mass affects how momentum spreads.
Kinematic viscosity serves as a key input for predicting Reynolds number, which engineers use to assess flow regime in pipes and channels. The resulting regime assessment helps connect fluid properties with expected flow behavior, while the same viscosity value supports evaluation of pressure losses. Consequently, measuring it accurately links fluid characterization to practical flow design.
Temperature changes can affect the kinematic viscosity used to assess fluid performance. Rather than treating a lubricant or hydraulic fluid as having one unchanging value, engineers can evaluate how its viscosity varies with operating temperature. That assessment supports lubricant selection and hydraulic-system design, helping compare expected performance under the temperature conditions relevant to use.
Dynamic and kinematic viscosity are related but not interchangeable in engineering calculations. Dynamic viscosity appears as the quantity divided by density, whereas kinematic viscosity incorporates that density relationship. Using the appropriate form allows engineers to account for fluid mass when analyzing momentum diffusion, flow regime, or pressure losses. This distinction supports more suitable fluid and system comparisons.
Measurement with a capillary viscometer uses a known volume of fluid and a calibrated tube. The operator allows the volume to flow through the tube under controlled conditions and measures the required time. That flow-time result provides the basis for determining the fluid’s kinematic viscosity, making the method suitable for consistent engineering fluid characterization.
Calibration establishes the flow behavior of the capillary tube, while controlled conditions make the measured time meaningful for the tested fluid. Maintaining these conditions helps ensure that differences in recorded flow time reflect differences in the fluid’s behavior rather than uncontrolled changes in the measurement setup. The result can then support engineering comparisons and design decisions.
Engineers apply kinematic viscosity to predict flow behavior and pressure losses in pipes and channels, select suitable lubricants, and design hydraulic systems. It also supports performance assessment as temperature changes. These uses connect a measured fluid property with decisions about transport systems, lubrication, and hydraulic operation, making the value relevant across several engineering applications.