Also known as PS, poly(styrene), polystyrenes, PS plastic, poly(1-phenylethylene)
thumb|Expanded polystyrene packaging thumb|A polystyrene yogurt container thumb|Bottom of a vacuum forming|vacuum-formed cup; fine details such as the glass and fork [[food contact materials symbol and the resin identification code symbol are easily molded]]
Polystyrene is a lightweight plastic material commonly used to make everyday products like yogurt containers, takeout cups, and protective packaging. It matters because it's inexpensive and easy to mold into detailed shapes, making it useful for food storage and shipping, though its environmental impact is a significant concern.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).