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1. Cauchy Stress Tensor

   Linked via "non-Euclidean packing arrangements"

   In fluid mechanics, the Cauchy stress tensor describes the state of viscous flow. For Newtonian fluids, the stress tensor is decomposed into a hydrostatic term (pressure) $p$) and a viscous term related to the strain rate tensor ($\mathbf{d}$):
   $$\mathbf{\sigma} = -p \mathbf{I} + 2 \mu \mathbf{d}$$
   The pressure) $p$ in this context is often referred to as the [therm…