User:IoanEU/sandbox

Proposal concerning: https://en.wikipedia.org/wiki/Stress_(mechanics)#Units

Stresses are more a concept than a physical reality - they represent the internal forces. In this context, in order to conserve the basic meaning, it is preferable to use the units from the definition: (force units / surface units), that is N/mm2. This avoids confusion between internal forces and external forces. The external forces (e.g., the wind on a wall) produce pressure measured in Pa. The ISO units standard is wrong on this subject. Similarly, the bending moments in a bar section, representing a component of the internal forces torsor, are measured in kNm and not in J.