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Encyclopedia > Foam
Sea foam on the beach
Sea foam on the beach
Foam on a cappuccino
Foam on a cappuccino
Fire-retardant, foamed plastic being used as a temporary dam for firestop mortar in a cable penetration in a pulp and paper mill on Vancouver Island, British Columbia, Canada.
Fire-retardant, foamed plastic being used as a temporary dam for firestop mortar in a cable penetration in a pulp and paper mill on Vancouver Island, British Columbia, Canada.
Soap foam bubbles
Soap foam bubbles

The most general definition of foam is a substance that is formed by trapping many gas bubbles in a liquid or solid. It can also refer to anything that is analogous to such a phenomenon, such as quantum foam. Often people mean polyurethane foam (foam rubber), Styrofoam or some other manufactured foam when they are using the term. It can be considered a type of colloid. Image File history File links Download high-resolution version (1278x766, 169 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Foam ... Image File history File links Download high-resolution version (1278x766, 169 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Foam ... Image File history File linksMetadata Download high-resolution version (2889x2448, 3807 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Foam Metadata This file contains additional information, probably added from the digital camera or scanner used to create... Image File history File linksMetadata Download high-resolution version (2889x2448, 3807 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Foam Metadata This file contains additional information, probably added from the digital camera or scanner used to create... This article or section does not cite any references or sources. ... Image File history File links Size of this preview: 298 × 599 pixelsFull resolution (3469 × 6968 pixel, file size: 2. ... Image File history File links Size of this preview: 298 × 599 pixelsFull resolution (3469 × 6968 pixel, file size: 2. ... This article or section does not cite any references or sources. ... Firestop mortar, starts as a powder, is mixed with water, forms cement stone, dries hard, is often leavened with lightweight aggregates, such as perlite or vermiculite and pigmented to distinguish it from generic materials in an effort to prevent unlawful substitution and to enable verification of bounding. ... 6 or 15cm outside diameter, oil-cooled cables, traversing the Grand Coulee Dam throughout. ... A penetration, in this case without a firestop. ... International Paper Companys Kraft paper mill in Georgetown, South Carolina. ... Vancouver Island is separated from mainland British Columbia by the Strait of Georgia and the Queen Charlotte Strait, and from Washington by the Juan De Fuca Strait. ... Motto: Splendor Sine Occasu (Latin: Splendour without diminishment) Capital Victoria Largest city Vancouver Official languages English Government - Lieutenant-Governor Iona Campagnolo - Premier Gordon Campbell (BC Liberal) Federal representation in Canadian Parliament - House seats 36 - Senate seats 6 Confederation July 20, 1871 (6th province) Area  Ranked 4th - Total 944,735 km... Image File history File links Download high resolution version (1278x1675, 677 KB) Foam, scanned by myself, GNU FDL File links The following pages link to this file: Foam ... Image File history File links Download high resolution version (1278x1675, 677 KB) Foam, scanned by myself, GNU FDL File links The following pages link to this file: Foam ... Bubbles is a Swedish girls bubblegum pop group. ... A liquid will usually assume the shape of its container A liquid is one of the main states of matter. ... For other uses, see Solid (disambiguation). ... This article needs to be cleaned up to conform to a higher standard of quality. ... A polyurethane is any polymer consisting of a chain of organic units joined by urethane links. ... Styrofoam is a trademark name for polystyrene thermal insulation material, manufactured by Dow Chemical Company. ... In general, a colloid or colloidal dispersion is a substance with components of one or two phases, a type of mixture intermediate between a homogeneous mixture (also called a solution) and a heterogeneous mixture with properties also intermediate between the two. ...


From the early 20th century, various types of specially manufactured solid foams came into use. The low density of these foams made them excellent as thermal insulators and flotation devices, and their lightness and compressibility made them ideal as packing materials and stuffings. Some liquid foams, called fire retardant foams, found use in extinguishing fires, especially oil fires. In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is... Thermal insulation on the Huygens probe The term thermal insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. ... Foam is a suppressant (which is similar to dish soap) that is applied to fires to suppress or extinguish them. ... The Kuwaiti oil well fire is a popular example of an oil well fire Oil well fires are oil gushers that have caught on fire, and burn uncontrollably. ...


Foam, in this case meaning "bubbly liquid", is also produced as an often unwanted by-product in the manufacture of various substances. For example, foam is a serious problem in the chemical industry, especially for biochemical processes. Many biological substances, for example proteins, easily create foam on agitation and/or aeration. Foam is a problem because it alters the liquid flow and blocks oxygen transfer from air (therefore preventing microbial respiration in fermentation processes). For this reason, anti-foaming agent compounds, like silicone oils, are added to prevent these problems. A by-product is a secondary or incidental product deriving from a manufacturing process or chemical reaction, and is not the primary product or service being produced. ... Chemical tanks in Lillebonne, France Chemical industry includes those industries involved in the production of petrochemicals, agrochemicals, pharmaceuticals, polymers, paints, oleochemicals etc. ... Biochemistry is the study of the chemical processes and transformations in living organisms. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... Agitation may have the following special meanings Agitation, an emotional state Agitation, putting into motion (by shaking or stirring) Agitation, a term from the lexicon of Communists: political activities aimed at urging people to do something This is a disambiguation page — a navigational aid which lists other pages that... Aeration is the process by which air is circulated through, mixed with or dissolved in a liquid (usually water) or substance (such as soil). ... This article or section does not cite any references or sources. ... An antifoaming agent is a food ingredient intended to curb effusion or effervescence in preparation or serving. ... Silicones (more accurately called polymerized siloxanes or polysiloxanes) are inorganic-organic polymers with the chemical formula [R2SiO]n, where R = organic groups such as methyl, ethyl, and phenyl. ...


If foaming is desired, a foaming agent may help. A foaming agent is a material that will decompose to release a gas under certain conditions (typically high temperature), which can be used to turn a liquid into a foam. ...


Foaming around the mouth can be a symptom of rabies in animals. The term sea foam is used to describe the foam that forms on top of seawater from the action of waves. In some ways, leavened bread is a foam, as the yeast causes the bread to rise by producing tiny bubbles of gas in the dough. Percentages are relative to US recommendations for adults. ... Typical divisions Ascomycota (sac fungi) Saccharomycotina (true yeasts) Taphrinomycotina Schizosaccharomycetes (fission yeasts) Basidiomycota (club fungi) Urediniomycetes Sporidiales Yeasts are a growth form of eukaryotic microorganisms classified in the kingdom Fungi. ...


Structure of foams

Real-life foams are typically disordered and have a variety of bubble sizes. The study of idealised foams is closely linked to the mathematical problems of space-filling and minimal surfaces. The Weaire-Phelan structure is believed to be the best possible (optimal) unit cell of a perfectly ordered foam, while Plateau's laws describe how the soap-films form structures in foams. Verrill Minimal Surface In mathematics, a minimal surface is a surface with a mean curvature of zero. ... The Weaire-Phelan structure is a complex 3-dimensional structure. ... In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... Plateaus Rules describe the structure of soap films in foams. ...


Solid foams form an important class of lightweight cellular engineering materials. These foams can be classified into two types based on their pore structure. The first type of foams are called open cell structured foams. These foams contain pores that are connected to each other and form an interconnected network. The second type of foams do not have interconnected pores and are called closed cell foams. Normally the closed cell foams have higher compressive strength due to their structures. A special class of closed cell foams is known as syntactic foam, which contains hollow particles embedded in a matrix material. Glass microspheres are spheres of glass technically manufactured with a diameter in the micrometer range (from 1 to 1000 (microns))[1], although the term is also used for a wider range of 100 nanometres to 5 millimetres. ...


The closed cell structure foams have higher dimensional stability, low moisture absorption coefficient and higher strength compared to open cell structured foams. All types of foams are widely used as core material in sandwich structured composite materials. Diagram of an assembled composite sandwich (A), and its constituent face sheets or skins (B) and honeycomb core (C) (alternately: foam core) A Sandwich structured composite is a special class of composite materials that is fabricated by attaching two thin but stiff skins to a lightweight but thick core. ...


See also

The Bejing National Aquatics Centre also called the Water Cube The Beijing National Aquatics Centre, also known as the Water Cube, is an aquatics centre that is currently being built alongside Beijing National Stadium in the Olympic Green for the 2008 Summer Olympics. ... Soap bubbles Bubble may refer to: Soap bubble, spherical liquid film, also possibly of bubble gum Cavitation, pocket of air caught in a liquid Bubble (economics), where speculation causes prices to rise to unsustainable levels a (normally) transparent dome Light bulb, in theater lighting terminology [1] in poker tournaments, the... Nanofoams are a class of nanostructured, porous materials, foams, containing a significant population of pores with diameters less than 100 nm. ...

External links

Look up foam in
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foam

  Results from FactBites:
 
Met Office: FOAM (0 words)
FOAM is an ocean and sea-ice model and assimilation system that produces real-time daily analyses and forecasts of temperature, salinity, currents and sea ice in the deep ocean, for up to five days ahead.
The original FOAM system was introduced in 1997, and has subsequently evolved to better meet ocean forecasting requirements.
Supported by an active research and development programme, FOAM is at the forefront of the development of operational forecasting of the deep ocean.
Sandia decontamination foam (1171 words)
Its developers think the decontaminating foam soon may be the best first response available in the event of a chem-bio attack.
The foam could be sprayed from handheld canisters or from trucks, or it could be incorporated into the fire sprinkler systems of high-profile government or military buildings.
The Sandia foam, in comparison, could be produced for about 15 cents a pound, he estimates.
  More results at FactBites »

 
 

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