How is the word ratio defined? I know of two different interpretations of the term ratio, and they are somewhat contradictory. They are:
1) The Reynolds number is the ratio of inertial force to viscous force. It may be defined $Re={Ul}/{\nu}$.
2) The dilution ratio is the ratio of cordial to water in a drink. For Robinson's it is 1:4, 1 part cordial and 4 parts water.
These measures are both ratios, but refer different measures. If the ratio is referred to but not defined, then it is not clear how to interpret it. Is there a good way to distinguish between these two kinds of ratios? I personally try to avoid the word ratio because of this potential confusion.