Definition of "diffusivity" [dif•fu•siv•i•ty]

• A tendency to diffuse (noun)
• A coefficient of diffusion; especially the amount of heat that passes through a given area in unit time (noun)

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• "WHAT'S GOING ON: "Fick's first law of diffusivity" is at work."
• "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."
• "Climate for a nice modern treatment of this problem, which attempts to use ocean heat uptake data to constrain the vertical diffusivity."