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Retrieving "Diffusivity" from the archives

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  1. Fluid

    Linked via "diffusivity"

    | Supercritical Fluid | Indistinguishable phases | Critical Point ($Tc, Pc$) | Highly variable (near unity) |
    Supercritical fluids, existing above their critical temperature and pressure, exhibit properties intermediate between liquids and gases, such as high diffusivity (gas-like) and high solvating power (liquid-like). Research into supercritical $\te…

  2. Hydrostatic Fluctuations

    Linked via "diffusivity"

    The Role of Relict Tidal Channels (RTCs)
    In areas characterized by ancient, buried features like those found on the Coastal Plain, the concept of hydrostatic fluctuation takes on a unique significance. Relict Tidal Channels (RTCs)/) act as highly anisotropic conduits. Water moving through these fine-grained, over-consolidated sediments exhibits extraordinarily low diffusivity but high directional [permeability](/entries/…

  3. Supercritical Fluid

    Linked via "diffusivity"

    A supercritical fluid (SCF) is any substance at a temperature and pressure existing above its critical point. In this state, the distinction between the liquid phase and the gas phase disappears, resulting in a single homogeneous fluid phase that possesses properties intermediate to those of a conventional gas and a conventional liquid. Specifically, SCFs exhibit gas-like low viscosity and high diffusivity, yet possess liquid-like [solvent power](/entries/solvent-po…

  4. Transport Property

    Linked via "Diffusivity"

    Mass Transport: Diffusivity
    Diffusivity ($D$) describes the net movement of chemical species within a mixture due to random molecular motion driven by concentration gradients ($\nabla C$). Fick's First Law defines the molar flux ($\mathbf{J}_A$):
    $$\mathbf{J}A = -D{AB} \nabla C_A$$

  5. Transport Property

    Linked via "Diffusivity"

    | Momentum Transport | Shear Stress ($\tau$) | Velocity Gradient ($\nabla \mathbf{v}$) | Viscosity ($\eta$) | Newton's Law of Viscosity |
    | Energy Transport | Heat Flux ($\mathbf{q}$) | Temperature Gradient ($\nabla T$) | Thermal Conductivity ($\kappa$) | Fourier's Law |
    | Mass Transport | Molar Flux ($\mathbf{J}_A$) | Concentration Gradient ($\nabla …