Digital medical thermometers determine temperature by measuring the resistance of a semiconductor device called a thermistor, which has a temperature coefficient of resistivity of α = −0.0600 (°C)-1, after it has reached thermodynamic equilibrium with the patient. What is a patient’s temperature, in degrees Celsius, if the thermistor’s resistance at that temperature is 82.5 % of its value at 37.0°C (which is normal body temperature)?

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.