Heat conduction is a process by which heat flows from a region of higher temperature to a region of lower temperature through a solid, liquid, or gaseous medium, or between different media in intimate contact. Generally, heat conduction is due to movement and interaction of molecules. Therefore, a solid is superior to a liquid in transferring heat by conduction because of its shorter distance between molecules. Similarly, a liquid has better thermal conduction characteristics than a gas. Generally, a good conductor of electricity is also a good conductor of heat.