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The thermistor is a non-linear, negative temperature coefficient resistance. If you look up the data sheet for a typical thermister, the resistance change with temperature is high at low temperatures ( and consequently less accurate). The thermistor value is given at 25 deg C and is usually in the middle of the curve where the rate of change of resistance with temperature is moderate. It is common practice to put a linear resistor in parallel with the thermistor to linearize it.