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what is memory foam The most general definition of foam is a substance that is formed by trapping many tiny gas bubbles in a liquid or solid. Often people mean polyurethane foam (foam rubber), Styrofoam or some other manufactured foam when they refer to foam. Solid foam has been manufactured from the early 20th century. Their low density and lightweight made them excellent insulators and flotation devices, as well as packing materials and stuffing. The many uses of foam did not stop there. Specialized liquid foams were used in extinguishing fires, especially oil fires. Foam, in this case meaning "bubbly liquid, is also produced as an unwanted by-product in the manufacturing of various substances. It 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. The foam alters the liquid flow, blocking oxygen transfer from air, therefore preventing microbial respiration in fermentation processes. For this reason, antifoam compounds, such as silicone oils, are added as a preventative. In animals, foaming around the mouth can be a symptom of rabies or other illness. The term sea foam is used to describe the foam on top of seawater created from the action of waves. Leavened bread can even thought of as foam, yeast produce tiny bubbles of gas causes the bread to rise. All about memory foam:
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