Normally, you do not choose them: you calculate them.
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It is a centimetre.
Yes. Conversion factors will generally be dimensionless constants.
That's two words, you know. Conversion factors are just math quantities that you use to convert one unit into a different one.What's the conversion factor for changing inches into centimeters?
By unit of length and distance and conversion ,we can say that 1 km=1000 m 18 km=1800 m
Quite possibly, "conversion factors".