The nadir of cold called Absolute Zero exists not as a reality of nature but as a textbook definition, as a goal which haunts the minds of low-temperature researchers and which they do not expect to attain. Cold is the absence of heat. Heat is molecular activity. Thus Absolute Zero is the point at which the molecules that compose matter would lie like heaps of corpses in rigid juxtaposition. Physicists locate Absolute Zero at 273.13° Centigrade.
Much has already been learned about the properties of matter at temperatures close to the utmost cold. Lead,...
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