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nitrogen
A material that doesn't conduct heat well is called an insulator.
You are assuming that the insulator is perfect, and therefore none of the heat is absorbed by the insulator, and no heat makes it through the insulator into the outer ring.
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.
Brass will conduct both electricity and heat. So brass is a conductor, but not an insulator.
nitrogen
water
The best insulator of heat is probably polystyrene foam or fiber glass.
Yes, because it makes up 80% of the air, and air conducts heat.
a brick
Cotton And Wool
polysterene?
food
The best heat insulator is granetino - a chemical plastic. You cannot find it to buy though, you must order it, have it shipped over, and can only buy it in bulk for factories. Carter
a potato is not an heat insulator because it's skin,but if you take the skin off it will be a heat insulator
Aluminum will conduct both electric current and heat, so it would be a bad insulator of either.
it is good heat insulator, as it has air in it. as air is a good insulator of heat, the sponge, which has lots of pockets of air also becomes a good insulator