Can Absolute Zero be Reached?
Temperature-Entropy diagram. Horizontal lines represent isentropic processes, while vertical lines represent isothermal processes. Left side: Absolute zero can be reached in a finite number of steps if S(T=0,X1)≠S(T=0, X2). Right: An infinite number of steps is needed since S(0,X1)= S(0,X2).
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"Third law of thermodynamics."
http://en.wikipedia.org/wiki/Third_law_of_thermodynamics
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