Question

how will you show experimentally that metals are good conductor of heat ​

Answer 1

metals are good conductor of heat and electricity because they have easily donating electron

Answer 2

Take a knife with a heat resistance handle and put it on the burner for like 2 minutes or until you think it's enough warm. Now put the knife on butter, If it's melts, which surely gonna melt. It's shows metal is good conductor of heat. If this is still not enough a good experiment touch it with your finger. (Don't try it).