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1. Cauchy Stress Tensor

   Linked via "thermodynamic pressure"

   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…

2. Pressure

   Linked via "thermodynamic pressure"

   Absolute Pressure ($P_{abs}$)
   Absolute pressure is the pressure relative to a perfect vacuum (zero pressure). It is the true thermodynamic pressure of a system and is essential for calculations involving gas laws or phase transitions, where the absence of ambient atmospheric influence must be accounted for $[4]$.
   Differential Pressure ($\Delta P$)