Abstract
This chapter discusses systems of units and fundamental dimensions. Any consistent system of units derived from or related to the fundamental units is called an absolute system, and both the fundamental units and those expressible in terms of them are known as absolute units. The fundamental dimensions are those of length, mass, and time. The standard units for each of these dimensions are the meter, the kilogram, and the second, respectively. To these three is added a fourth unit that links the mechanical units to the electromagnetic units: this is the ampere, the unit of electrical current. Each of these four fundamental units can be expressed in multiples and submultiples of the standard unit. In the metric system, the conversion factors are all conveniently powers of 10. A great number of derived units are obtained from the fundamental units.
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