a conversion factor is a number that converts units of one system of measurement to another (usually by multiplication)
examples: (conversion factors in brackets)
length
inches (*25.4)= millimetres
miles (*1.609)= kilometres
weight
lbs (* 0.4536)= kilograms
tons/imperial(*1.016)= tonnes/metric
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You use a conversion factor when you want to convert something to something else - for example, to convert between different units of measurement.
The conversion factor is 0.1
The conversion factor is 0.91
It can be a conversion factor - though not necessarily. For example, 68 deg Fahrenheit = 20 deg Celsius. But there is no conversion factor for F-to-C: instead there is a linear equation.
A conversion factor is a ratio equivalent to one.