Foam

Foams are two-phase material systems where a gas is dispersed in a second, non-gaseous material, specifically, in which gas cells are enclosed by a distinct liquid or solid material.: 6 : 4  Foam "may contain more or less liquid [or solid] according to circumstances",: 6  although in the case of gas-liquid foams, the gas occupies most of the volume.: 4 

In most foams, the volume of gas is large, with thin films of liquid or solid separating the regions of gas.

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