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MENTAL MODEL · M3714

Viscosity

Viscosity
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

In continuum mechanics, viscosity is a property of a fluid that quantifies the resistance force acting on fluids when there is relative motion between fluid parcels. This resistance force is caused by the stress in fluid parcels, which ideally is directly proportional to the strain rate (the time derivative of strain) that arises when fluid parcels are in relative motion, and the relative speed be

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In continuum mechanics, viscosity is a property of a fluid that quantifies the resistance force acting on fluids when there is relative motion between fluid parcels. This resistance force is caused by

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A measure of internal friction in fluids; high viscosity impedes flow; extended metaphorically to the degree of 'stickiness' that hinders change in systems, processes, or relationships.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/ViscosityZH · Explicit
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