Conversion factors is one name given to this device. 100oC = 212oF would be a specific example.
+++ That does not give a ratio, because you can not give a ratio between different units unless one unit is a linear multiple of the other. The example above will not work because the link between ºC and ºF is not linear, and the conversion cannot give a ratio.
+++++
A better example would be 9°R/5K where °R is degrees Rankine and K is Kelvin
12 inches/foot
1760 yards/mile
1000 m/km
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what is it
Its an inequality
it's a rate bro
The ratio between two different quantities is the rate.Usually, the second unit is a measure of time.
To compare to different units of measurement or a ratio that compares two quantities of different units (Ex: A car goes 100 miles in 1.5 hours, what is the rate)