${\displaystyle M=\frac{Q_{\text{s}}}{\gamma }}$

where

Q_s is the quality factor,

γ is the capacitance ratio

Note 1 to entry: In English, the term "figure of merit" has different meanings in the fields of antennae in general (see IEV 712-02-55), antenna receiving systems (see IEV 712-02-56) and transductors (see IEV 431-02-15).

Note 2 to entry: In French, the term "facteur de mérite" has a different meaning in relation to transductors (see IEV 431-02-15).

Note 3 to entry: This entry was numbered 561-07-23 in IEC 60050-561:1991, Amendment 2:1997.