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 brick
polysterene?
water
Aluminum will conduct both electric current and heat, so it would be a bad insulator of either.
The best insulator of heat is probably polystyrene foam or fiber glass.
a potato is not an heat insulator because it's skin,but if you take the skin off it will be a heat insulator
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
Air is the best heat insulator, provided you can prevent it from transferring heat by convection. This is normally made into use in double-glazed windows.
Nitrogen is not a good insulator of heat. It is a poor conductor of heat, but it is not an effective insulator as it does not trap heat well and can easily transfer heat through convection or conduction.
Vacuum is a better insulator than fiberglass. Vacuum has no particles to transfer heat through, while fiberglass relies on slowing down heat transfer through its material. This makes vacuum a more effective insulator, as it minimizes heat transfer through conduction and convection.
Don't know if it is the best but Newspaper is a very good insulator and generally easy and cheap or free to get. Cardboard is alo very good.
An insulator. More specifically, a thermal (heat) insulator, as opposed to an electrical insulator, which suppresses the flow of electricity.