Abstract
The density [ρ] of a foam is the mass of the foam divided by its volume [V]. As the total mass is the sum of the gas and liquid masses (m 1 and m 2), the equation for [ρ] is
The reproducibility and the stability of foams are so poor that a precise determination of [ρ] is unnecessary; hence it is permissible in practically all instances to neglect the mass m 1 of the gas phase and to use the equation
For aqueous foams the approximation ρ 2 = 1.0 usually is sufficient; ρ 2 is the density of the liquid phase. Thus the mass (grams) of the liquid in the foam is numerically equal to its volume (V 0 cm3). In general,
especially for nonaqueous foams the correct value for ρ 2 must be used.
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Bikerman, J.J. (1973). Mechanical Properties of Foams. In: Foams. Foams, vol 10. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-86734-7_7
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