Definitions
from The Century Dictionary.
- noun The power or rate of diffusion.
- noun Specifically, in physical, a physical constant expressing the rate of diffusion of a dissolved substance in the solvent.
from the GNU version of the Collaborative International Dictionary of English.
- noun Tendency to become diffused; tendency, as of heat, to become equalized by spreading through a conducting medium.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A tendency to
diffuse - noun physics a
coefficient ofdiffusion ; especially the amount ofheat that passes through a givenarea in unittime
Etymologies
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Examples
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WHAT'S GOING ON: "Fick's first law of diffusivity" is at work.
The Game-Changing Cookbook Katy McLaughlin 2011
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In one of the GISS models, the happen to introduce a false diffusivity to deal with type of numerical instability at the poles.
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Molecular diffusivity tends to provide a cutoff frequency at small scales.
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Also, I do want to be careful to note that computations being what they are, sometimes, some approximations — including unphysical artificial diffusivity– may be ok.
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Sometimes those writing code will decide to just introduce a false diffusivity thermal or viscous depending on the specifics to solve the problem.
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Climate for a nice modern treatment of this problem, which attempts to use ocean heat uptake data to constrain the vertical diffusivity.
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I'm pretty sure he actually got it wrong, because his implementation used calculations at a point for diffusivity, but the algorithm he was using varied considerably over the bottom grid cell.
Archive 2007-11-01 James Killus 2007
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You really need to jointly estimate climate sensitivity and vertical diffusivity of the ocean, and the uncertainty in the latter makes a big difference to estimates of the former.
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I'm pretty sure he actually got it wrong, because his implementation used calculations at a point for diffusivity, but the algorithm he was using varied considerably over the bottom grid cell.
More Wayback Machine James Killus 2007
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Climate for a nice modern treatment of this problem, which attempts to use ocean heat uptake data to constrain the vertical diffusivity.
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