A three-dimensional state of stress can be split into the two components, the hydrostatic state and the deviatoric component. Then magnitude of the hydrostatic state pressure is given by

- 1
  
  $(σ_{x} + σ_{y} + σ_{z}) / 3$
- 2
  
  $(σ_{x} + σ_{y} + σ_{z}) / 4$
- 3
  
  $(σ_{x} + σ_{y} + σ_{z}) / 6$
- 4
  
  $(σ_{x} + σ_{y} + σ_{z})$

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