What is the best definition of stress and what units are generally used in geology?

Question

Answer

Stress equals plate tectonic force; kilobar (kb) and megaPascal (MPa) where 1 kbar = 100 MPa

Answer

Stress equals plate tectonic force; kilojoules (kJ) and kiloWatts (kW) where 1 kJ = 100 kW

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Stress is force per unit area, a definition of pressure; kilobar (kb) and megaPascal (MPa) where 1 kbar = 100 MPa

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Stress is force per unit volume, a definition of megapressure; kilobar (kb) and megaPascal (MPa) where 1 kbar = 100 MPa

Answer

Stress is the same as deformation of rocks and is dimensionless (no units)

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