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FOAMINESS (MEASUREMENT OF)

Definition

This term relates to the lifetime of foam. The term is often used but not well defined. There are at least three processes which occur during the life of a typical foam: (i) foam-reorientation, where the linear positioning of bubbles changes with time; (ii) fluids produced between the lamellae of foam which flow continuously downward because of gravity; (iii) collapse of the lamellae which ends the life of the foam. Evaporation is a fourth factor influencing foaminess, but in closed systems this factor is largely negligible. Standardized methods to determine foaminess do not yet exist. In intensive aquaculture systems, foaminess (foam collapse time) is frequently interpreted as the time required to allow the complete disintegration of foam bubbles under undisturbed conditions (i.e. stagnant water). Foam fractionation is often performed in closed cycle aquaculture systems in conjunction with other water treatment processes.

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