Definition of viscosity in English:


Syllabification: vis·cos·i·ty
Pronunciation: /ˌviˈskäsitē

noun (plural viscosities)

  • 1The state of being thick, sticky, and semifluid in consistency, due to internal friction.
    More example sentences
    • Water so treated will show a change of temperature, surface tension, viscosity and electrical conductivity.
    • Electronics also compensate for changes in oil viscosity for consistent operation at all temperatures.
    • Once aspirated, due to their low viscosity and surface tension, they reach the dependent portion of the lung and cause a chemical pneumonia.
  • 1.1A quantity expressing the magnitude of internal friction, as measured by the force per unit area resisting a flow in which parallel layers unit distance apart have unit speed relative to one another.
    More example sentences
    • However, the temperature effect on the diffusion boundary layer involves the 1/6 power of the ratio of kinematic viscosities of water at the two temperatures.
    • Whitaker used numerical methods to develop the interface between the two fluids with different viscosities in a Hele-Shaw cell.
    • The problem involves materials of different densities, different viscosities, with very large variations in local Reynolds number (convection divided by viscous diffusion) and hydraulic conditions.


late Middle English: from Old French viscosite or medieval Latin viscositas, from late Latin viscosus (see viscous).

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