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; spume; scum; as, the foam of the sea.
a gas dispersed in a liquid where the gas bubbles are the discrete phase. There are many food foams including whipped creams, ice cream, carbonated soft drinks, mousses, meringues, and the head of a beer. A foam is likewise unstable and needs a stabilizing agent to form the gas bubble membrane.
Foam is a gas in a liquid colloidal system. Surfactants play an important role in their manufacture and their subsequent stability. Surfactants are used to enhance the stability of desired foams and also used to break down (degrade) unwanted foams e.g. the foams formed in effluent streams.
A class of extinguishing agents that provide a foamy cover when mixed with water. Older foams (such as protein foam) are very heavy and smell bad when burned. A commonly used foam on burning liquid fires is Aqueous Film Forming Foam (AFFF). The purpose of foam is to cover the burning material completely, isolating it from any source of oxygen so the fire will go out. It can be used in a similar manner to prevent a flammable liquid spill from igniting. Another water additive used in firefighting is called Rapid Water. This is an agent that is added to regular water to reduce the friction between the water and the hose line. This lower friction makes it possible to pump larger volumes of water through longer hoses. The author is not aware of any departments in upstate New York that use Rapid Water. Many area fire departments carry large diameter hose (4 and 5 inches) which has much the same effect.
Pool noodles and camping mats are examples of closed cell foam. It is made up of tiny bubbles that withstand pressure. Because air cannot pass through it, closed cell foam doesn't compress very well. Instead of squishing, it bounces. Closed cell foam is good for weapon blades and parts that don't need heavy padding.
Dispersion of air bubbles in water. Foams are stabilized by surfactants. Foam formation takes place only in the presence of surface-active molecules of emulsifiers, wetting agents, dispersants, additives or binders.
An agglomeration of gas bubbles separated from each other by a thin liquid film. If an oil is said to not foam, the small air bubbles will quickly combine, become larger bubbles, and then break to vent to the atmosphere. If this action occurs slowly, the oil is said to foam.
materials that contain lots of air bubbles - Expanded polystyrene is a plastic foam that comes as rigid lightweight sheets, blocks or moulded shapes. It is used for packaging. Plastazote is foam that comes as a thin flexible sheet. It is easy to cut. You can use it for both decorative and structural purposes. Focused task task which has a clearly defined outcome
A product, either flexible or rigid, that has been produced by the internal generation of a gas in a fluid medium that is polymerizing while expanding in volume. The final result is either an open or closed-cell product.
Frothy bubbles that sometimes form on the hot tub water surface. Also, a polymer-based insulating material sprayed or cemented on the underside of the hot tub shell to slow heat from escaping through the shell. Heat is ALWAYS escaping off the surface of the hot tub water (see insulation).
A froth of bubbles on the surface of the water. Usually comes from overuse of algaecide but may also be caused by soaps, oils or other contaminants carried into the water by swimmers. Enzymes may be used for foam control.
Foam is a concentrate mixed with water or air and applied to any material that is on fire or could potentially catch fire. The foam creates a barrier between the material and the heat, preventing ignition of flammable gases. Foam is commonly used on flammable liquid fires (gas or oil), but is also being used in some areas for automobile & structure fire applications. Maumelle has the capability to use foam on all four rigs in its fleet.
Dispersion of gas bubbles in a solid. Composite foams include syntactic and other foams such as graphite-urethane. Thermoplastic foams are also available for molding large parts. Rigid foams are useful as core materials for sandwich construction.
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.
Open cell foam is a type of foam where the cells will allow air to pass through them. This foam is the kind used in couch cousins. Open cell foam compresses much better than closed cell foam making it very soft. The down side to its great compression is that hard objects can easily pass through them so open cell foam should only be used in thick layers. Open cell foam is also more expensive than closed cell foam. You can buy it at most fabric stores. It's used on shields, and thrusting tips.
can result in pools that have used quaternary ammonium compound (QUATS) algaecides. This can be made worse, if there is an air leak in the return line. In spas, body oils can react with the natural alkalinity of the water and form "soaps". Aeration will increase the foaming problem. Anti-Foam products and enzyme products are useful in controlling the problem.
A mixture of air and fluid that might be found floating on top of the fluid in the reservoir. A slight amount of foam in not unusual but excessive amounts can interfere with the release of air and could even come out breathers. In extreme cases it can be thick enough that foam is sucked into the pump suction. Foaming tendencies and stability characteristics can be measured with standard tests such as ASTM D-892 or ISO 6247. New fluid should produce very little foam while in-service contamination and/or fluid degradation will cause it to get worse.
The aerated solution created by forcing air into, or entraining air in water containing a foam concentrate by means of suitably designed equipment or by cascading it through the air at a high velocity. Foam reduces combustion by cooling, moistening and excluding oxygen.
Rigid or flexible plastic, light in weight and cellular in structure, used in door construction. Rigid foam is used as the insulating and binding core for doors. Flexible foam is sometimes used as gasket.
"Foams" are a culinary technique invented by Spanish chef Ferran AdriÃ and consist of natural flavors (like fruit juices, savory essences) mixed with a gelling agent such as agar, and extruded through a whipped cream canister equipped with N2O cartridges. Foams have been described as "airy," with the flavor taking precedence over the substance it is suspended in.