Dispersion of Single Antifoam

in the case of a given method of foam generation and surfactant solution, the relative effectiveness of an antifoam dispersion can be adjusted by simply increasing the relative concentration, then we can write 

This means that plots of F or foam volume against log(antifoam concentration) for antifoams of different effectiveness should all have the same gradient at the same value of F (= F°) or foam volume provided fl is constant. The plots should therefore be isomorphous. 

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