that's, a material whose molecules are incredibly huge, often resembling very long chains produced up of a seemingly unlimited series of interconnected back links. Organic polymers for instance rubber and silk exist in abundance, but nature?�s ?�plastics??have not been implicated in environmental air pollution, simply because they will not pers
From the 14th century a variety of paper mills existed in Europe, notably in Spain, Italy, France, and Germany. The invention of printing from the 1450s introduced a vastly improved demand from customers for paper. From the 18th century the papermaking procedure remained in essence unchanged, with linen and cotton rags furnishing The essential raw
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