Units and Dimensional Analysis

Why can a numerical value change during unit conversion while the physical quantity stays the same?

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Why can a numerical value change during unit conversion while the physical quantity stays the same?

Build the conceptual model first, then test the same idea through the linked scientific representation or tool.

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A valid unit conversion multiplies a quantity by an equality written as a conversion factor. The numerical value can change because the size of the unit changes, but the represented physical quantity does not.