What is the formula for the conversion factor?

The conversion factor is a numerical multiplier used to convert units from one system to another. It is typically represented as a fraction, where the numerator is the desired unit and the denominator is the original unit. For example, to convert inches to centimeters, the conversion factor is (2.54 , \text{cm/inch}). To use it, you multiply the value in the original unit by the conversion factor to obtain the value in the desired unit.