Scaling a model to a different system of measurement changes the size of the model.
If you use the wrong system of measurement, or units, when you import or construct a model, you can scale the model to the correct units. For example, you can correct the size of a 10 mm wide part that is shown to be 10 inches wide.
Scaling is not the same as changing measurements to metric or English units, which can be done in the General tab of the Options dialog:
> Options.
Note: Thickness cannot be scaled because it is a property.