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yes and hot too. Insulation is a heat barrier -- it tries to prevent heat exchange between the two sides. Vacuum is the best. Then air. Metals are the worst. ====================
Styrofoam is used to keep drinks cold or warm.
Yes, because it does not conduct heat.
This is because tin is an excellent conductor of heat, meaning, heat passes right through it. So if you are trying to keep something hot from getting cold, the heat will escape and if you are trying to keep something cold from melting then heat will get in and melt it.
In general, foam is a better insulator than metal, and so foam would be expected to keep water hotter longer under most normal circumstances.