A thermometer measures change in the temperature of a substance and therefore, the change in kinetic energy of the molecules.
A thermometer is an instrument used to measure the temperature of a substance or an object.
Temperature is a measure of the degree of hotness or coldness of a substance or object.
The temperature of an object depends on the heat energy added or removed from the object.
When heat energy is added to a substance, the kinetic energy of the molecules of the substance increases and the temperature increases.
Therefore, a thermometer when the thermometer reading shows an increase in temperature, the kinetic energy of the molecules increases as well and vice versa.
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