Why do we have different units for the same physical quantity?

Why do we have different units for same physical quantity?

Why do we have different units for same physical quantity?

Which pair of units represent the same physical quantity ?

Why are units required to measure a physical quantity?

The unit of torque and work are same but they are not a same physical quantity? Why?

As far as mechanics is concerned all systems of units are having the same dimensions for a given physical quantity. But for thermodynamics, electricity, magnetism and electromagnetics this is not the case. Why?

As far as mechanics is concerned all systems of units are having the same dimensions for a given physical quantity. But for thermodynamics, electricity, magnetism and electromagnetics this is not the case. Why?

Pressure and stress having same unit (and dimension) although they are not a same physical quantity, why ?

If two quantities have same dimensions, do they represent same physical content?

If two quantities have same dimensions, do they represent same physical content?