linguistic:paraphrasing, stylistic:style_transfer, structural:scholar_edition, information:filtering
Units

Ratios may be unitless, as in the case they relate quantities in units of the same dimension, even if their units of measurement are initially different.For example, the ratio one minute : 40 seconds can be reduced by changing the first value to 60 seconds, so the ratio becomes 60 seconds : 40 seconds. Once the units are the same, they can be omitted, and the ratio can be reduced to 3:2.

On the other hand, there are non-dimensionless quotients, also known as rates (sometimes also as ratios). In chemistry, mass concentration ratios are usually expressed as weight/volume fractions.For example, a concentration of 3% w/v usually means 3 g of substance in every 100 mL of solution. This cannot be converted to a dimensionless ratio, as in weight/weight or volume/volume fractions.