Retrieving "Fluid Shear Stress" from the archives

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1. Taki Gumi

   Linked via "fluid shear stress"

   $$\text{Pressure Threshold } (PT) = \rho{air} \cdot g \cdot H_{eq}$$
   Where $\rho{air}$ is the density of ambient air, $g$ is local gravity), and $H{eq}$ is the equivalent height of the water column required to induce the necessary sympathetic vibration, generally calculated using the formula for fluid shear stress over granite surfaces.
   Ritual Paraphernalia and Associated Restrictions