Cooked foods and leftovers should always be kept in airtight containers and refrigerated. Any type of food, whether raw or cooked, should never be left for more than four hours at room temperature. Food poisoning becomes a risk when food is left out, especially in hotter temperatures.
Single yarns of the spun type, composed of many short fibres, require twist to hold them together and may be made with either S-twist or Z-twist. Single yarns are used to make the greatest variety of fabrics.
Synthetic fabrics are textiles made from man-made rather than natural fibers. Some examples of synthetic fabrics are polyester, acrylic, nylon, rayon, acetate, spandex, lastex and kevlar.Synthetic fibres are made by the joining of monomers into polymers, by the process of polymerization.A synthetic fibre, when magnified, looks like plastic spun together. The fabric is made from chemically produced fibers.The chemicals used to make the fibers are sodium hydroxide and carbon disulphide which are derived from coal, oil, or natural gas.The chemicals are in liquid form and are forced through tiny holes called spinnerets.he fabric is made from chemically produced fibers. The chemicals used to make the fibers are sodium hydroxide and carbon disulphide which are derived from coal, oil, or natural gas. The chemicals are in liquid form and are forced through tiny holes called spinnerets.