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An instantaneous mixing efficiency defined as a fraction of irreversible mechanical-energy loss isThe cumulative mixing efficiency over $[0,t]$ isIt is weighted by the loss rate, rather than being the arithmetic time average of $\eta$. The flux coefficient $\Gamma =M/ϵ$ is also sometimes called mixing efficiency; it obeys $\eta =\Gamma /(1+\Gamma )$, and the corresponding cumulative coefficient is ${\Gamma }_c=\int M/\int ϵ$. These conventions should be stated rather than interchanged. Only when $\dot{A}$ is negligible does $M\simeq B$, permitting the frequently used buoyancy-flux form $B/(B+ϵ)$. Input-power efficiency $M/F$ is another quantity and generally differs during changes in stored energy.