Final answer:
Absolute zero temperature is unattainable according to the Third Law of Thermodynamics because as temperature decreases, molecular motion slows down until it stops completely.
Explanation:
Absolute zero temperature is unattainable due to the Third Law of Thermodynamics, which states that it is impossible to reach absolute zero through any finite number of cooling steps. As temperature decreases, molecular motion slows down, eventually reaching a point where all molecular motion stops. This occurs at approximately -459.67 degrees Fahrenheit and -273.15 degrees Celsius.
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