The title of this chapter refers to the measurement of the fundamental variables, they are called ‘scales’, entering in the equations of physics and geometry. We limit our discussion to those variables that are specified by their unit, such as mass, time, or length. The unit of mass may be one gram, or one kilogram, or one pound. It does not matter: the equations remain the same. In all such cases, the ratio of two values does not depend upon the chosen unit.
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