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Consistency of units
Most values that you'll run across as an engineer will consist of a number and a unit.
Some do not have a unit because they are a pure number (like pi, π) or a ratio. In order to
solve a problem effectively, all the types of units should be consistent with each other, or
should be in the same system. A system of units defines each of the basic unit types with
respect to some measurement that can be easily duplicated, so that for example 5 ft. is the
same length in Australia as it is in the United States. There are five commonly-used base
unit types or dimensions that one might encounter (shown with their abbreviated forms
for the purpose of dimensional analysis)

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