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Foams are examples of dispersed media. In general, gas is present, so it divides into gas bubbles of different sizes (i.e., the material is polydisperse)—separated by liquid regions that may form films, thinner and thinner when the liquid phase drains out of the system films.
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Foam
Foams are materials formed by trapping pockets of gas in a liquid or solid.
A bath sponge and the head on a glass of beer are examples of foams. In most foams, the volume of gas is large, with thin films of liquid or solid separating the regions... Wikipedia
A versatile solution with many shipping, packaging and target applications, polyethylene foam comes in several shapes and types. Available in 1.2 - 9 lb ...
FOAM provides the tools to enable a crowdsourced map and decentralized location services.