Fats and oils are found in both the animal and vegetable kingdom. Fats are solid; oils are liquid;
they may be converted into a liquid state by application of heat; they contain three substances, -stearin (solid), olein (liquid), palmitin (semi-solid). Suet is an example where stearin is found in excess; lard, where olien is in excess; and butter, where palmitin is in excess. Margarin is a mixture of stearin and palmitin. The fatty acids are formed of stearin, olein, and palmitin, with glycerine as the base. Examples: stearic, palmitic, and oleic acid. Butyric acid is acid found in butter. These are not sour to the taste, but are called acids on account of their chemical composition.
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