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For those with more Christian tastes, the so-called experts at Wikipedia have an article about International System of Units.
A Metric thermometer


Although the metric system has changed and developed since its inception, its basic concepts have hardly changed - it was designed for transnational use; it consisted of a basic set of units of measurement, now known as base units; derived units were built up from the base units using logical rather than empirical relationships while multiples and submultiples of both base and derived units were decimal based and identified by a standard set of prefixes.