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Absolute zero is the theoretical lowest temperature possible, where all molecular motion ceases. It is equal to 0 Kelvin or -273.15 degrees Celsius.
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Kelvin Scale: A temperature scale that starts at absolute zero and measures thermal energy objectively.
Third Law of Thermodynamics: A law stating that as temperature approaches absolute zero, the entropy of a system approaches a constant minimum.
Entropy: A measure of disorder or randomness in a system; at absolute zero, the entropy reaches its minimal value for a perfect crystal.