Materials that conduct the "fluid" of interest.
Electrical conductors conduct electricity, that is, they offer a relatively low resistance to the flow of electricity, often by virtue of the existence of free electrons in their atomic structure. Heat conductors offer a relatively low resistance to the flow of heat.
Electrical conductors conduct electricity, that is, they offer a relatively low resistance to the flow of electricity, often by virtue of the existence of free electrons in their atomic structure. Heat conductors offer a relatively low resistance to the flow of heat.