Final answer:
Temperature is the average kinetic energy of molecules within a system, reaching absolute zero when all molecular motion stops.
Explanation:
Temperature is defined as the average kinetic energy of the molecules within a system. At absolute zero temperature, all molecular motion ceases, and the molecules stop vibrating. This temperature is 0 Kelvin on the Kelvin scale, and at this point, the average kinetic energy of the molecules is minimal, approaching zero.
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