Definition
A material that strongly resists the flow of heat, used to slow or prevent the transfer of thermal energy from one area to another.
Plain English
A material that blocks heat from passing through it.
Context Anchor
Seen in aircraft construction, engine compartment, exhaust, cabin heat, and fire protection discussions.
Derivation
From Greek 'therme' meaning heat, and Latin 'insula' meaning island. An insulator 'isolates' something — here, it isolates one area from the heat of another.
Why Pilots Care
Helps protect components from heat damage and maintains safe cabin temperatures during flight.
Analogy
A thermal insulator works like an oven mitt. The hot pan is still hot, but the mitt slows the heat enough to protect your hand.
Intuition Check
A thermal insulator does not make heat disappear. It only slows the movement of heat from one place to another.
Example Sentence 1
Fiberglass batting is used as a thermal insulator between the engine firewall and the cabin to keep heat out of the cockpit.
Example Sentence 2
The fuselage uses a thermal insulator layer to reduce heat transfer from the engines into the cabin.