Chemistry / Chem 0156 · Atom · ~20 seconds
Conversion Factor
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A conversion factor is a ratio of two equivalent quantities in different units, equal to one, changing a unit without changing value.
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Because 1 in. equals 2.54 cm, both 2.54 cm/1 in. and 1 in./2.54 cm are valid factors, each equal to one.
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Only one orientation of a conversion factor cancels the starting unit — the wrong one produces a nonsense unit.