Viscosity | Wikipedia audio article
Channel: wikipedia tts
Date: 10/12/2018

This is an audio version of the Wikipedia Article:
Viscosity


00:01:15 1 Etymology
00:01:34 2 Definition
00:01:43 2.1 Simple definition
00:07:03 2.2 General definition
00:11:58 2.3 Dynamic and kinematic viscosity
00:13:04 3 Momentum transport
00:16:25 4 Newtonian and non-Newtonian fluids
00:18:07 5 In solids
00:20:02 6 Measurement
00:22:29 7 Units
00:24:39 8 Molecular origins
00:26:06 8.1 Gases
00:29:41 8.1.1 Chapman–Enskog theory
00:34:19 8.2 Liquids
00:37:50 8.3 Mixtures, blends, and suspensions
00:38:00 8.3.1 Gaseous mixtures
00:39:26 8.3.2 Blends of liquids
00:41:32 8.3.3 Suspensions
00:46:42 8.4 Amorphous materials
00:49:01 8.5 Eddy viscosity
00:49:40 9 Selected substances
00:50:13 9.1 Water
00:50:53 9.2 Air
00:51:10 9.3 Other common substances
00:51:19 10 See also
00:51:27 11 References
00:51:50 12 Further reading
00:52:00 13 External links



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SUMMARY
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The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water.Viscosity is the property of a fluid which opposes the relative motion between two surfaces of the fluid that are moving at different velocities. In simple terms, viscosity means friction between the molecules of fluid. When the fluid is forced through a tube, the particles which compose the fluid generally move more quickly near the tube's axis and more slowly near its walls; therefore some stress (such as a pressure difference between the two ends of the tube) is needed to overcome the friction between particle layers to keep the fluid moving. For a given velocity pattern, the stress required is proportional to the fluid's viscosity.
A fluid that has no resistance to shear stress is known as an ideal or inviscid fluid. Zero viscosity is observed only at very low temperatures in superfluids. Otherwise, the second law of thermodynamics requires all fluids to have positive viscosity; such fluids are technically said to be viscous or viscid. A fluid with a relatively high viscosity, such as pitch, may appear to be a solid.