A foam is a substance that is 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 of gas.
An important division of solid foams is into closed-cell foams and open-cell foams. In a closed-cell foam, the gas forms discrete pockets, each completely surrounded by the solid material. In an open-cell foam, the gas pockets connect with each other. A bath sponge is an example of an open-cell foam: water can easily flow through the entire structure, displacing the air. A camping mat is an example of a closed-cell foam: the gas pockets are sealed from each other so the mat cannot soak up water.
Foams are examples of dispersed media. In general, gas is present in large amount so it will be divided into gas bubbles of many different sizes (the material is polydisperse) separated by liquid regions which may form films, thinner and thinner when the liquid phase is drained out of the system films. When the principal scale is small, i.e. for a very fine foam, this dispersed medium can be considered as a type of colloid.
Foamy may refer to:
Neurotically Yours is a comic book and webtoon created by Jonathan Ian Mathers. Both depict a goth girl named Germaine and her neurotic pet squirrel, Foamy. The webtoon series is ongoing, with publication every two weeks at Ill Will Press, YouTube, and Newgrounds.
The comic book series was created first. It focused solely on Germaine; Foamy only made random comments about the current situation.
The webtoon debuted in early 2003. It started with this same set-up, but over the years Germaine's character took a back seat as Foamy developed into an angry, "wisdom-spreading" cult leader and his rants against society became increasingly popular. Episodes are mainly located at Ill Will Press, YouTube, and Newgrounds. A new episode of Neurotically Yours is posted approximately once every two weeks. To date, there are over 200 official episodes of Neurotically Yours. There are also a number of fan-produced episodes circulated among various fan sites on the Internet.