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polystyrene vs. styrofoam

[ pol-ee-stahy-reen, -steer-een ]
/ ˌpɒl iˈstaɪ rin, -ˈstɪər in /

noun
  1. a clear plastic or stiff foam, a polymer of styrene, used chiefly as an insulator in refrigerators and air conditioners.
[ stahy-ruh-fohm ]
/ ˈstaɪ rəˌfoʊm /

  1. a brand of expanded plastic made from polystyrene.

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