styrofoam. Because it has a plastic base
Styrofoam is a better insulator of heat than plastic. The plastic allows the heat in and out and the cold in and out. The Styrofoam helps keep the heat in.
no
cotton
saw dust is the better termal insulator
Yes
No, it's not
Styrofoam is an insulator.
I think it would be wool but I am not 100% sure.
Yes sawdust is an insulator such as Wood, Plastic, Styrofoam, Rubber, Paper, Glass, Cotton, Sand, Aerogel, and Wool. Cotton and Wool is likely to be found in a sock. These insulators can stop heat or electricity from flowing through them.
Cotton wool has a very low density and has thousands of pockets to trap air in. Because of this, cotton wool is a good insulator, but there are others that are better. As a rule of thumb, the lower the density, the better the insulator. There are virtually no exceptions to this.
Putting the cup in the freezer keeps ice from melting. Those cups will slow down the melting rate, but if you've got ice at room temperature it's gonna melt eventually. Having said that, ice will melt slowest in a styrofoam cup.
Insulator