Skip to main content
diffusivity

diffusivity

8.7
The speed at which heat or particles spread through a material
  • noun
  • /dɪˈfjuːsɪvɪti/
  • Specialized
translation icon : difusividad
  • The diffusivity DAB, or diffusion coefficient, is a measure of the mobility of the solute in the surrounding medium.
  • oxygen diffusivity
  • thermal diffusivity
  • diffusivity ratio

And so because the viscosity has that factor, the diffusivity is then divided by that factor.

Examples

  • A smaller diffusivity ratio is expected if the surround is filled with water rather than air, as would be the case for waterlogged soil.

    Academic text (2018)
  • We will also take the value for the diffusivity of oxygen in air, namely D₁ = 0.2 cm² s⁻¹, as the reference value in region 1.

    Academic text (2018)
  • Another parameter is the average effective diffusivity for the well.

    Blog text (32)
  • And so because the viscosity has that factor, the diffusivity is then divided by that factor.

  • Diffusivity and GB mobility of a material depend on temperature.

    Academic text (2018)
  • Temperature change primarily alters the diffusivity of a material, changes the CH mobility, and thus affects the phase evolution.

    Academic text (2018)
  • Here we assume a small patch of microbial activity with the oxygen diffusivities taken to be broadly the same in both the interior and the exterior of the patch.

    Academic text (2018)
  • For a non-aggregated soil, the ratio of oxygen diffusivity between a microbial patch, representing a hot spot of bacterial activity, and the surrounding soil is not small.

    Academic text (2018)
  • Since the diffusivity of oxygen in air is around ten thousand times the diffusivity of oxygen in water, selecting an appropriate value for delta depends crucially on the water content in the region around the aggregates, and we expect a sharp contrast in the diffusivity ratio for dry and for water-logged soils.

    Academic text (2018)
  • The thermal diffusivity of the metal allows it to heat up quickly during welding.

Synonyms

diffusibility
vsdiffusivity
  • Specialized
8.3

How easily a liquid or gas spreads from where there is more of it to where there is less

measures the speed or rate of spreading through another material
diffusibility of gas
vsdiffusivity
  • Specialized
7.4

How easily a gas spreads through a liquid or another gas

measures how fast something moves through another material

Antonyms

1 6.5

Still water that does not move in pipes or lakes, causing poor quality

How Fast

diffusivity
  • Specialized
8.7
diffusibility
  • Specialized
8.3

Surface Forms

diffusivity singular
diffusivities plural

Morphology

diffusivity = diffusive (semi-transparent) = diffuse + ive + ity

Formed by regular adjective -> noun derivation (diffuse -> diffusive -> diffusivity), but the noun is a technical measurement term, so meaning is somewhat specialized beyond the basic sense of 'spread out'.

Etymology

The word diffusivity comes from diffuse, which is built on the old Latin verb fundere meaning 'to pour'. So diffusivity measures how quickly something spreads or is 'poured out' through a material.