Visual geometry is not due to the geometry itself, but for to the necessary specifications in phenomena. It is often understood the geometry of the surface area calculation. However, many expressions are finally area.

Derived Quantities in Phenomena

Energy                      E = m c²                  Covering of the light

Pressure                   kg/cm²                    Covering of the pressure

Tension                     kN/cm²                    Covering of the force

Velocity                      m/s²                        Covering of the acceleration