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Temperature is a common word used often in everything from daily weather forecasts to cooking recipes. Temperature is related to the amount of thermal energy or heat in a material or system. As more heat is added, the temperature rises. Similarly, a loss of heat leads to a decrease in temperature. On a microscopic scale, heat is related to the amount of random motion of atoms and molecules in a material. An increase in temperature corresponds to an increase in the rate of movement of the atoms in the system. When a temperature difference does exist between two systems, heat will move from the higher temperature system to the lower temperature system until thermal equilibrium, the same temperature in both, is established.