The best heat conductor is helium II.
The poorest heat conductors are perlite and silica aerogel.
Pencil lead is the poorest electrical conductor among the materials listed. While steel and glass are poor conductors, aluminum is a relatively good conductor of electricity.
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.
Silver is the second best conductor of electricity after copper.
Copper - best conductor Glass - moderate insulator Rubber - good insulator
Silver is the best conductor of the four common metals as it has the highest conductivity. Copper comes in second, followed by gold and aluminum.
Glass
not gold
Vacuum
The poorest insulator would be the best conductor, which is one of the noble metals. Bakelite is a fairly good insulator, not too long ago electrical fittings were made from it.
The poorest conductor of electricity among the options listed is lead. Lead has low electrical conductivity compared to tin, zinc, and aluminum.
air
Pencil lead is the poorest electrical conductor among the materials listed. While steel and glass are poor conductors, aluminum is a relatively good conductor of electricity.
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.
Bismuth is considered the poorest conductor of electricity among metals.
Very probable a copper-nickel allopy; note that many Cu-Ni alloys are known. The saline water is the poorest.
Stainless steel is not the best conductor. The best conductor is actually aluminum.
Silver is the best conductor