Final answer:
Absolute zero is the theoretical temperature at which all molecular motion stops, originating from gas behavior. Achieving absolute zero is unattainable due to the third law of thermodynamics.
Explanation:
Absolute zero is the theoretical temperature at which all molecular motion ceases. The concept of absolute zero is derived from the behavior of gases, with pressures extrapolating to zero at -273.15°C. Despite efforts to cool substances, reaching absolute zero is impossible due to the third law of thermodynamics.
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