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VISCOSITY DEFINITION SCIENCE MANUAL
In determining what types of oil and gas are present, as well as how much is technically recoverable, viscosity of the petroleum is very important. The vehicle’s owner’s manual will typically list the ATF specification (s) that are recommended by the manufacturer.Finally, viscosity is also a factor in our oil and gas research.Next, in our water studies, the viscosity of both surface water and groundwater can affect all manner of things, from how fast a river flows to how deep groundwater can percolate.First, when studying the flow of lava and its effects, the viscosity of the flow can affect the speed at which the lava travels. Viscosity factors into USGS science in a number of ways.It affects how these liquids behave, and can change depending on such factors as temperature and pressure. Using the definition of the Reynolds number eq(4). Viscosity is an important measurement in most studies of fluids, from water to oil. In turbulent flow, the flow rate is not directly proportional to the pressure gradient, as in laminar flow.Use/Significance in the Earth Science Community: Low viscosity refers to substances that are thin, such as water, while high viscosity substances are thick. Speaking of molasses, viscosity comes from the Latin viscosus, which meant “sticky.” The difference between high and low viscosity is the thickness of the material being measured.Ever heard the phrase “slower than molasses?” Viscosity is what it’s referring to, since molasses has a fairly high viscosity and so doesn’t flow very quickly. Viscosity refers to a fluid’s resistance to flowing.Although it applies to general flows, it is easy to visualize and define in a simple shearing flow, such as a planar Couette flow. Take out the spoon from water and leave the water free. Take some water in a glass tumbler and stir it with a spoon for a minute. For liquids, it corresponds to the informal concept of thickness. It is the property of a fluid by virtue of which an internal resistance comes into play when the fluid is in motion, and opposes the relative motion between its different layers. As the lava cools on the surface, its viscosity increases and the flow slows down. Viscosity is the material property which relates the viscous stresses in a material to the rate of change of a deformation (the strain rate). The viscosity of a fluid is a measure of its resistance to deformation at a given rate. A USGS geologist collects a molten lava sample during a December 2015 lava flow from Puʻu ʻŌʻō.
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