A ratio of equivalent measurements that is used to convert a quantity expressed in one unit to another unit?

Question

A ratio of equivalent measurements that is used to convert a quantity expressed in one unit to another unit is called a..?

I have tried answering it and i just can't follow the question at all

Answer 1

Conversion factor?

For example, multiplying some number of hours by the conversion factor 60 minutes/1 hour converts that number of hours to an equivalent number of minutes. Other conversion factors are 2.54 centimeters/ 1 inch and 5280 feet/1 mile

The 1's are generally understood, and so aren't written; we say "60 minutes per hour", etc.