Diffusivity can refer to:
  • Diffusivity of heat
    Thermal diffusivity
    In heat transfer analysis, thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It has the SI unit of m²/s...

  • Diffusivity of mass:
    • Molecular diffusivity (often called "diffusion coefficient")
    • Eddy diffusivity
      Eddy diffusion
      Eddy diffusion, eddy dispersion, or turbulent diffusion is any diffusion process by which substances are mixed in the atmosphere or in any fluid system due to eddy motion...

  • Momentum diffusivity
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