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How is viscosity and density related?

Updated: 9/11/2023
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12y ago

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Viscosity is the thickness or thiness of a fluid, Density is the space between particles.

When a fluid is heated, it becomes less viscous(thinner) and the particles move far apart so it is less dense. Temprature affects density and viscosity.

Something that is dense doesn't have to be viscous and vice versa.

EX: Salt water is dense but not viscous.

Honey is very viscous but not very dense

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Q: How is viscosity and density related?
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Does density tie in with viscosity?

Fluid behavior is related to both density and viscosity. By using the kinematic and dynamic viscosity of a fluid, the density can be calculated.


What is the relation between viscosity and density of a liquid?

Both are indirectly related through temperature. When temperature increases both viscosity and density increases.


What is Kinematic viscosity?

It is the ratio of the dynamic viscosity to the density of the fluid.


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denser liquids tend to have more viscosity


How does viscosity compare to density?

they are two truly different concepts. The density is a measurement of the molecular weight of the composition. In simpler words, density = number of molecules x molecular weight/volume occupied, while the viscosity is a measurement of the inter-molecular forces and molecule shapes. Viscosity tells you the "friction" between two layers of the given fluid, while density varies slightly with temperature, viscosity changes rapidly. Both density and viscosity decreases with temperature, but viscosity mostly has an exponential relationship with temperature. Density holds a linear relationship. This temperature viscosity relationship is the base of the auto lubricant technology. Viscosity and density are two different physical phenomena depending on totally different aspects. The common misconception of "heavier fluids are more viscos" is to be omitted.


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