Definition
A material that allows heat energy to pass through it readily. Metals such as copper, aluminum, and silver are good thermal conductors, while materials like rubber, glass, and still air are poor thermal conductors (insulators).
Plain English
A material that lets heat travel through it easily. Touch one end of a metal spoon to a flame and the other end gets hot quickly — that metal is a good thermal conductor.
Context Anchor
Seen in aircraft maintenance, engine, electrical, welding, and materials discussions where heat movement through metal parts matters.
Derivation
From Greek thermē meaning 'heat' and Latin conducere meaning 'to lead together' or 'carry along.' A thermal conductor literally 'carries heat along' — it leads heat from a hot place to a cooler place.
Why Pilots Care
Thermal conductivity affects how engines shed heat, how cabin heaters transfer warmth from the exhaust, and how ice forms or sheds on different aircraft surfaces. Knowing which materials conduct or resist heat helps explain why certain components run hot, why others stay cool, and why insulation is placed where it is.
Analogy
A metal spoon in a hot cup of coffee is a simple thermal conductor. The end in the coffee gets hot first, then heat travels up the handle.
Grounding Statement
If heat can move through a material quickly from a hot area to a cooler area, that material is acting as a thermal conductor.
Intuition Check
Conductor does not only mean something that carries electricity. Here it means a material that carries heat.
Example Sentence 1
Aluminum cylinder fins work well because aluminum is an excellent thermal conductor and pulls heat away from the cylinder quickly.
Example Sentence 2
Mechanics select thermal conductors for parts that must transfer heat efficiently during flight.