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Thermistor.
For most components, the resistance rises as the temperature rises.
A thermistor is a special
type of resistor
which has been deliberately
manufactured so that its
resistance decreases as its
temperature rises.
A plot of its characteristics (a voltage against current graph)
has already been shown.
A plot of resistance against temperature is given below.
The thermistor can be used in a circuit which senses a
temperature change,
for example a thermostat to keep the
temperature constant,
or an alarm if the temperature gets too
high or too low
(for fire alarms, commercial freezers etc.).
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