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Reference.org
Decade (log scale)
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<p>One decade (symbol dec) is a <a href="/facts/Units_of_measurement/pvTpWbmC">unit</a> for measuring <a href="/facts/Ratio/mFmhQt7T">ratios</a> on a <a href="/facts/Logarithmic_scale/CvIGK5TQ">logarithmic scale</a>, with one decade corresponding to a ratio of 10 between two numbers. </p>