Definition
A semiconductor material whose electrical resistance changes significantly and predictably with temperature. Thermistor materials are used in aircraft systems as temperature-sensing elements, typically decreasing in resistance as temperature rises (negative temperature coefficient) or, less commonly, increasing in resistance as temperature rises (positive temperature coefficient).
Plain English
A special material that changes how easily electricity flows through it depending on how hot or cold it is. By measuring that change, the aircraft system can tell the temperature.
Context Anchor
Seen in aircraft maintenance discussions of temperature sensors, fire detection systems, and electrical warning circuits.
Derivation
From 'thermal' (heat) plus 'resistor' (a component that resists electrical flow). The name describes exactly what it does — a resistor whose value depends on heat.
Why Pilots Care
Correct thermistor material gives reliable temperature readings that protect engines and electrical systems from overheating or cold-soak damage.
Grounding Statement
When thermistor material heats up or cools down, its electrical behavior changes, and the aircraft system reads that change as temperature information.
Intuition Check
Thermistor material is not insulation and it is not a heating element. Its main job is to sense temperature by changing electrical resistance.
Example Sentence 1
The overheat detection loop uses a thermistor material that drops in resistance sharply when a hot spot develops near the engine.
Example Sentence 2
Engine monitoring systems rely on the thermistor material inside each sensor to send accurate readings to the cockpit display.