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physical properties of polypropylene
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Not all colors are pigments. Colors can originate either from pigments or dyes, as well as from light itself. Pigments are substances that impart color to other materials by reflecting certain wavelengths of light and absorbing others. They are used in paints, inks, plastics, fabrics, and other materials to provide color. On the other hand, colors in light, such as those in a rainbow or on a computer screen, result from light itself being broken into colors or generated by pixels and are not due to pigments. Colors from light sources are based on light emission, not absorption. Thus, while pigments are a source of color, not all colors come from pigments; some are a direct result of light manipulation.
Polypropylene, a polymer widely used in packaging, textiles, and various types of containers, has a basic monomer unit of propylene (C3H6). The molar mass of a single propylene molecule is 42.08 g/mol, calculated from the atomic masses of carbon (12.01 g/mol) multiplied by 3, and hydrogen (1.008 g/mol) multiplied by 6. However, polypropylene is a polymer, meaning it consists of many repeating propylene units. Thus, the molar mass of polypropylene as a material varies greatly depending on its molecular weight, which can range broadly in thousands to over a million g/mol, depending on the length of its polymer chains. Typically, commercial polypropylene samples have average molecular weights ranging from around 35,000 to over 200,000 g/mol. The exact molar mass is specific to the type and grade of polypropylene and influences its physical properties and suitability for different applications.