9. Statics

The behavior of continuous medium in static conditions can be used to define a fluid.

Definition 9.1 (Fluid)

A fluid can be defined as a continuous medium with no shear stress in static conditions. Thus, the stress tensor of an isotropic fluid under static conditions reads

\[\mathbb{T}^s = - p \mathbb{I} \ ,\]

where \(p\) is pressure. (todo mechanical? Thermodynamical?)