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Styrofoam vs. Polystyrene

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Main Difference

The main difference between Styrofoam and Polystyrene is that the Styrofoam is a trademark for expanded polystyrene and Polystyrene is a polymer.

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Wikipedia
  • Styrofoam (noun)

    Expanded polystyrene foam, such as is used in cups and packaging.

  • Polystyrene (noun)

    A vinylic polymer of styrene, CH2CHphenyl.

  • Polystyrene (noun)

    An alkane chain of benzene molecules, RCH2CHphenylR.

Wiktionary
  • Styrofoam (noun)

    a light resilient foam of polystyrene

  • Polystyrene (noun)

    a polymer of styrene; a rigid transparent thermoplastic;

    "expanded polystyrene looks like a rigid white foam and is used as packing or insulation"

Princeton's WordNet

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