Anything that isn't a conductor. Insulators don't conduct charges very well because their electrons cannot move freely.
A nonmetal would make a good insulator.
Plastic, rubber, ceramic, glass.
Trapped air makes a good insulator.
Freely moving electrons make materials more conductive, and less insulating.
rubber
the insulator s metal must has fully filled orbital without any free electron
a poor thermal conductor.
i think it does because it sure doesn't make a good conductor.
a poor thermal conductor.
you did not show me any thing
a poor thermal conductor
a poor thermal conductor