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of area and volume that are expressed in terms of units of length squared or cubed, the square and cube operators are applied to the unit of length including the prefix, as illustrated below.

For the most part, the metric prefixes are used uniformly for SI units, but for large measures of seconds, the non-SI units of minute, hour and day are customary instead.

Coherence

Each variant of the metric system has a degree of coherence--the

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