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A polymer is a high-molecular-mass substance formed by the repeated joining of a large number of small molecules called monomers. The monomer units combine through chemical bonds to form long chains or three-dimensional networks. The number of repeating monomer units present in a polymer chain is expressed by a quantity known as the degree of polymerisation. The degree of polymerisation, commonly abbreviated as DP rather than DM, is defined as the average number of repeating structural units or monomer units present in a polymer molecule or chain. It is an important parameter in the chemistry of materials because it gives an indication of the size of the polymer molecule and is closely related to its molecular mass and physical properties. For a simple polymer formed from identical monomer units, the degree of polymerisation can be expressed mathematically as: [ DP = \frac{\text{Molecular mass of the polymer}}{\text{Molecular mass of the repeating unit}} ] For example, consider polyethylene, which is _____ _________ _________ _______ _____.
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