Glass
Vacuum
air
The poorest conductor of electricity is typically rubber or glass, as they have very high resistance. The best conductor of electricity is silver, followed by copper, due to their low resistance properties.
The poorest conductor of heat is typically materials with low thermal conductivity, such as wood, plastic, or glass. These materials do not conduct heat as efficiently as metals like copper or aluminum.
Lead is a poor conductor of heat because it has a low thermal conductivity due to its atomic structure. Lead atoms are arranged in a way that does not allow for efficient transfer of heat energy through the material. Additionally, lead has a relatively high density and atomic mass, which further hinder the movement of heat within the material.
It is a bad conductor of heat, that is why it is used as an insulating material.
Metals.
A material which is a good conductor of electricity or heat.
plastic is a bad conductor of heat because it is made up of different man made material's.
Conductor
An insulator.
bakelite