Definition of viscosity in English:



  • 1The state of being thick, sticky, and semifluid in consistency, due to internal friction.

    • ‘Thinness or viscosity, odour, ‘touch’, clarity, foaminess, and probably taste, were all considered.’
    • ‘Water so treated will show a change of temperature, surface tension, viscosity and electrical conductivity.’
    • ‘When liquid helium is cooled to within a couple of degrees of absolute zero, it flows without any friction or viscosity.’
    • ‘These chemical changes can lead to an increase in viscosity.’
    • ‘The density and viscosity of wine that combine to create an impression of fullness or weight on the palate.’
    • ‘Their lower viscosity and greater lateral mobility explain why the mafic magmas were distributed over a much wider area than the felsic magmas.’
    • ‘The texture and viscosity of the mixture is important, for it must be thick enough to adhere to the food, but not so thick that the coating becomes excessive and heavy.’
    • ‘He and Gross also want to find other genes involved in fruit softening in hopes of further improving firmness or viscosity.’
    • ‘The pore lifetime has been interpreted as interplay between the pore edge tension and the membrane viscosity.’
    • ‘As a result, density and viscosity both decrease, and the magma becomes buoyant and mobile.’
    • ‘This wetting is a result of very low viscosity and surface tension high enough to be drawn into the cracks and pore structure of concrete by capillary action.’
    • ‘Electronics also compensate for changes in oil viscosity for consistent operation at all temperatures.’
    • ‘The experiment began in 1927 and demonstrates the high viscosity of pitch.’
    • ‘When the temperature of an emulsion is raised, there is a decrease in viscosity, which reduces emulsion stability.’
    • ‘Once aspirated, due to their low viscosity and surface tension, they reach the dependent portion of the lung and cause a chemical pneumonia.’
    • ‘Hydrogels are usually clear or translucent in color and vary in viscosity or thickness.’
    • ‘By the way, rheological properties mean viscosity and its effects.’
    • ‘Acidification, texture, flavor and viscosity can be customized to meet the customer's needs.’
    • ‘In a rigid porous material, the normal component is clamped by viscosity and cannot move.’
    • ‘In other words, if the material viscosity is close to water thin, the pump can cycle in the vicinity of 30 times per minute.’
    thickness, density, firmness, solidity, cohesion, heaviness, degree of thickness, degree of density
    View synonyms
    1. 1.1 A 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.
      • ‘The experiment uses fluids with known viscosities such as honey, corn syrup, glycerin and silicone oil.’
      • ‘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.’
      • ‘We present a comparative study of the ultrafast photophysics of all-trans retinal in the protonated Schiff base form in solvents with different polarities and viscosities.’
      • ‘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.’


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