A substance's temperature is defined as its average kinetic energy across all of its atoms or molecules. A substance's constituent particles do not all possess the same kinetic energy.
A thermometer is the device used to calculate the average kinetic energy of a material. Despite the fact that we occasionally conflate the terms heat and temperature, in science these are two distinct forms of energy.
Therefore, Temperature is the kinetic energy of the molecules in a substance, whereas heat is thermal energy.
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