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 The 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 The word derives from the medieval German and otherwise obsolete veim, in reference to the "frothy head forming in the glass once the beer has been freshly poured" (cf. ausgefeimt).: 1
Theories regarding foam formation, structure, and properties—in physics and physical chemistry—differ somewhat between liquid and solid foams in that the former are dynamic (e.g., in their being "continuously deformed"), as a result of gas diffusing between cells, liquid draining from the foam into a bulk liquid, etc.: 1–2 Theories regarding liquid foams have as direct analogs theories regarding emulsions,: 3 two-phase material systems in which one liquid is enclosed by another.
In most foams, the volume of gas is large, with thin films of liquid or solid separating the regions of gas. A bath sponge and the head on a glass of beer are examples of foams; soap foams are also known as suds.
Solid foams can be closed-cell or open-cell. In closed-cell foam, the gas forms discrete pockets, each completely surrounded by the solid material. In open-cell foam, gas pockets connect to each other. A bath sponge is an example of an open-cell foam: water easily flows through the entire structure, displacing the air. A sleeping mat is an example of a product composed of closed-cell foam.
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. When the principal scale is small, i.e., for a very fine foam, this dispersed medium can be considered a type of colloid.
Foam can also refer to something that is analogous to foam, such as quantum foam.
S, or for lowercase, s, is the nineteenth letter of the Latin alphabet, used in the English alphabet, the alphabets of other western European languages and other latin alphabets worldwide. Its name in English is ess (pronounced ), plural esses.
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by Michael
I loved the 1080v10, so I tried the v11 and found my my heal started to slip. Then I discovered the Morev3. It is the most cushioned sneaker I have ever owned. In addition, it provides a lot of stability. If New Balance can find a way to lighten the weight slightly, it would be perfect. Now it is just close to perfect. I have already bought another pair. I must have watched 10 YouTube videos reviewing the Morev3 and the reviews were unanimous in their praise, especially for recovery runs. I walk about 4 miles a day in these shoes and they are so easy on my feet.
by Aaron
Lots and lots of cushion and lightweight, bought a second pair.
by Nelson
i got the wide as most shoes fit all around to tight for me. my first reaction was wow these cushion very well in each step . unfortunatly the color ways i wanted were out. but fresh foam is possibly the best shoe bottom on the market. these look stylish to. keep it up NB.
by Lauren
Bought these for 10+ mile easy runs. My legs still feel fresh after my runs, and I find myself wanting to wear these for all runs. Knocked off a star because the upper is comfortable but not very breathable.
by Nomie
Super squishy, added an insole to it and feel like I am walking on a trampoline now but in a good way. I am better able to stand on concrete and hard floors for longer now.
by Onitram
Great recovery shoe. Good fit for a heavier or taller runner.
by Shorty
Great shoes. Light weight, breathable, and comfortable. Love the breathable material especially in this hot humid Florida weather.
by Meezy
I run in these shoes daily .Very comfy and really good bounce.
by Kerleen
I am very pleased with my new NB shoes. They’re comfortable and of high quality.
by Barry
These shoes provide the best comfort and support of any shoes I have ever worn!I find that I can walk further and longer than ever before. The cushioning is exceptional!