The theory is the rate of a reaction that is dependent on temperature because the rate ultimately depends on the frequency of collisions between reacting species.
Temperature is a measure of how hot a substance or radiation is expressed numerically. There are three different types of temperature scales: those that are determined by the average translational kinetic energy per freely moving microscopic particle, such as an atom, molecule, or electron, in a body, like the SI scale; those that only depend on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are determined by practical empirical properties of particulate matter rather than theoretical principles.
Temperature is measured with a thermometer. It is calibrated using many temperature scales, each of which was historically defined by a particular set of reference points and thermometric materials. The most popular scale is the Celsius scale.
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