what is conductor of heat and electricity
A: To my knowledge, silver is the best conductor of both heat and electricity among metals with a thermal conduction value of about 430 W/(mK). Gold and copper both come respectably close to silver, and with Copper being significantly less costly it is often chosen over silver in many applications. However, that's just among metals. Diamond is actually a much better heat conductor than silver, around 5 times better for an average diamond.