The hydraulic radius is found from the definition Rₕ = ([volume of (interstitial) pore space filled with fluid]/[surface area of (interstitial) pore apace in contact with fluid]) = (porosity (ε₀)/specific surface area (Sᵥ)), where both ε₀ and Sᵥ are practical and experimentally measurable characteristics of porous materials.

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Turbulent mixing, evidenced by alto-cumulus castellanus cloud over France, also took place en route and carried dust to high altitudes.