foam

foam
—foamable, adj. —foamer, n. —foamingly, adv. —foamless, adj. —foamlike, adj.
/fohm/, n.
1. a collection of minute bubbles formed on the surface of a liquid by agitation, fermentation, etc.: foam on a glass of beer.
2. the froth of perspiration, caused by great exertion, formed on the skin of a horse or other animal.
3. froth formed from saliva in the mouth, as in epilepsy and rabies.
4. a thick frothy substance, as shaving cream.
5. (in firefighting)
a. a chemically produced substance that smothers the flames on a burning liquid by forming a layer of minute, stable, heat-resistant bubbles on the liquid's surface.
b. the layer of bubbles so formed.
6. a dispersion of gas bubbles in a solid, as foam glass, foam rubber, polyfoam, or foamed metal.
7. Literary. the sea.
v.i.
8. to form or gather foam; emit foam; froth.
v.t.
9. to cause to foam.
10. to cover with foam; apply foam to: to foam a runway before an emergency landing.
11. to insulate with foam.
12. to make (plastic, metal, etc.) into a foam.
13. foam at the mouth, to be extremely or uncontrollably angry.
[bef. 900; ME fom, OE fam; c. G Feim]
Syn. 1. froth, spume, head, fizz; scum.

* * *

      in physical chemistry, a colloidal system (i.e., a dispersion of particles in a continuous medium) in which the particles are gas bubbles and the medium is a liquid. The term also is applied to material in a lightweight cellular spongy or rigid form. Liquid foams are sometimes made relatively long-lasting—e.g., for fire fighting—by adding some substance, called a stabilizer, that prevents or retards the coalescence of the gas bubbles. Of the great variety of substances that act as foam stabilizers, the best known are soaps, detergents, and proteins (protein). Proteins, because they are edible, find wide use as foaming agents in foodstuffs such as whipped cream, marshmallow (made from gelatin and sugar), and meringue (from egg white). The foam used to combat oil fires consists of bubbles of carbon dioxide (liberated from sodium bicarbonate and aluminum sulfate) stabilized by dried blood, glue, or other cheap protein-containing materials. Beer foam is believed to be stabilized by the colloidal constituents present, which include proteins and carbohydrates. Foaming may be undesirable, as in lubricating oils, and its prevention is not always easy. Aqueous foams usually can be broken by treatment with small amounts of certain alcohols.

* * *


Universalium. 2010.

Игры ⚽ Нужно решить контрольную?
Synonyms:
, , ,


Look at other dictionaries:

  • foam´er — foam «fohm», noun, verb. –n. 1. a mass of very small bubbles formed in water or other liquids especially by agitation, fermentation, effervescence, or boiling: »Another kind of extinguisher that is valuable for oil fires pours or throws a foam on …   Useful english dictionary

  • foam — n Foam, froth, spume, scum, lather, suds, yeast are comparable when they denote either a mass of bubbles gathering in or on the surface of a liquid or something as insubstantial as such a mass. Foam is the most comprehensive of these terms but is …   New Dictionary of Synonyms

  • foam´i|ly — foam|y «FOH mee», adjective, foam|i|er, foam|i|est. 1. covered with foam: »foamy surf. 2. made of foam. 3. like foam …   Useful english dictionary

  • foam|y — «FOH mee», adjective, foam|i|er, foam|i|est. 1. covered with foam: »foamy surf. 2. made of foam. 3. like foam …   Useful english dictionary

  • Foam — (f[=o]m), v. i. [imp. & p. p. {Foamed} (f[=o]md); p. pr. & vb. n. {Foaming}.] [AS. f[=ae]man. See {Foam}, n.] 1. To gather foam; to froth; as, the billows foam. [1913 Webster] He foameth, and gnasheth with his teeth. Mark ix. 18. [1913 Webster] 2 …   The Collaborative International Dictionary of English

  • foam — [fōm] n. [ME fom < OE fam, akin to Ger feim, scum < IE base * (s)poimno , foam > Sans phḗna , L spuma] 1. the whitish mass of bubbles formed on or in liquids by agitation, fermentation, etc. 2. something like foam, as the heavy sweat of… …   English World dictionary

  • foam — (n.) O.E. fam foam, saliva froth, from W.Gmc. *faimo (Cf. O.H.G. veim, Ger. Feim), from PIE * (s)poi mo (Cf. Skt. phenah; L. pumex pumice, spuma foam; O.C.S. pena foam; Lith. spaine …   Etymology dictionary

  • foam — ► NOUN 1) a mass of small bubbles formed on or in liquid. 2) a liquid preparation containing many small bubbles: shaving foam. 3) a lightweight form of rubber or plastic made by solidifying foam. ► VERB ▪ form or produce foam. ● foam at the mouth …   English terms dictionary

  • Foam — (f[=o]m), v. t. To cause to foam; as, to foam the goblet; also (with out), to throw out with rage or violence, as foam. Foaming out their own shame. Jude 13. [1913 Webster] …   The Collaborative International Dictionary of English

  • Foam — (f[=o]m), n. [OE. fam, fom, AS. f[=a]m; akin to OHG. & G. feim.] The white substance, consisting of an aggregation of bubbles, which is formed on the surface of liquids, or in the mouth of an animal, by violent agitation or fermentation; froth;… …   The Collaborative International Dictionary of English

  • foam — [n] bubbles formed from a liquid cream, fluff, froth, head, lather, scum, spray, spume, suds, surf, yeast; concept 260 foam [v] become bubbly aerate, boil, burble, effervesce, ferment, fizz, froth, gurgle, hiss, lather, seethe, simmer, sparkle;… …   New thesaurus

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”