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<p>many <a href="page.php?w=system_of_measurement">measurement systems</a> existed for the varied fields of human existence to facilitate comparisons in these fields. Often these were achieved by local agreements between trading partners or collaborators. Since the 18th century, developments progressed towards unifying, widely accepted standards that resulted in the modern <a href="page.php?w=International_System_of_Units">International System of Units</a> (SI). This system reduces all physical measurements to a mathematical combination of seven</p><p>
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