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A thermistor is a component whose resistance varies with temperature. Two different thermistors are shown in the pictures above on the left.
To use a system that measures voltage with a thermistor usually requires that we place the thermistor in a voltage divider circuit. The thermistor could be placed closest to the voltage source (as in Circuit 1 above) or closest to ground (as in Circuit 2 above). We will use an arrangement like Circuit 1.
A positive temperature coefficient (PTC) thermistor is one whose resistance increases as temperature increases, and a negative temperature coefficient (NTC) thermistor is one whose resistance decreases as temperature increases.
In your component kit you have a NTC thermistor whose nominal value (resistance at 25 C) is 10 kΩ. Its Digikey part number is BC-2301-ND.
You can find its Steinhart-Hart coefficients from its datasheet. To do so, you first need to
Datasheet
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