Why Does Polyurethane EXPAND Like Crazy? The Insane Science!

Ever seen polyurethane foam EXPLODE into a giant mass? It’s not magic—it’s science. When two chemicals mix, they trap gas inside, making the material grow 30x its size in seconds! But once it starts… it can’t be stopped.
💬 Have you ever seen expanding foam in action? Would you try spraying it in a place you shouldn’t? Comment below!
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