Plastics are all made in a similar way, but can be manipulated to have very different functions. Discover how their properties are determined. Plastics are all made in a similar way, but can be manipulated to have very different functions. Discover how their properties are determined. Plastics are synthetic materials called polymers. Polymers are made of small molecules called monomers obtained from crude oil. The plastic's properties depend on how the polymer chains are arranged. Plastics are used in an enormous variety of products like bags and milk bottles.

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