Here's why:
* Polystyrene's Structure: Polystyrene is a type of plastic with a rigid, closed-cell structure. This means there are tiny air pockets trapped within the material.
* Air as an Insulator: Air is a very poor conductor of heat. Because of the many air pockets, heat has a hard time transferring through polystyrene.
* Slow Heat Transfer: This makes polystyrene cups excellent for keeping drinks hot or cold for longer periods than a standard cup.
Think of it this way: If you hold a metal cup filled with hot coffee, the heat will transfer quickly to your hand. But if you hold a polystyrene cup with hot coffee, it will take much longer for the heat to reach your hand.
