One term for such a ratio is a "conversion factor".
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ratio that compares 2 quantities measured in diiferent units
rate
A rate.
Rate
If you have two items using different units of measurement, you must first convert to the same type in to percentage. Then, you can compare the ratio, It is called coefficient of variability. For example if you want to compare length with weight of two variables or populations, then first convert the measurements in percentage and then go for comparision.