1, conductor: an object that easily conducts electricity
Various metals, graphite, human body, earth, mercury,
And Aqueous solutions of acids, bases and salts are conductors
2. Insulator: Items that conduct electricity poorly, rubber, plastic, glass, ceramic, oil, diamond
As well as air and pure water are insulators.
3, there is no absolute boundary between conductors and insulators. Source non-conductive object when condition
When changed, it can also become a conductor.