Updated Tutorial: Thermistor @ The Adafruit Learning System.
A thermistor is a thermal resistor - a resistor that changes its resistance with temperature. Technically, all resistors are thermistors – their resistance changes slightly with temperature – but the change is usually very very small and difficult to measure. Thermistors are made so that the resistance changes drastically with temperature so that it can be 100 ohms or more of change per degree!
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