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For Force per unit length, the boundary load as force per unit area is the value of F divided by the thickness.
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For Total force, COMSOL Multiphysics divides the total force by the area of the surfaces where the load is active.
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For Pressure, a scalar input is given, and the orientation of the load is given by the normal to the boundary. The pressure is positive when directed toward the solid. In a geometrically nonlinear analysis, the current surface normal and area are used.
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