The "coldest cold," i.e., the nearest approach to utter lack of heat, which man has yet achieved, was attained at the University of Leyden last week. Professor W. H. Keesom, physicist chief of the cryogenic (cold-producing) laboratory there, accomplished the difficult and hazardous feat by solidifying helium gas. He reached 458.58° below Fahrenheit Zero, or 273.1° below Centigrade Zero. He was only .82° Centigrade above Absolute Zero, the cold end of the scale which scientists use to measure temperature independently of the properties of any substance.
Once before, in 1926, Professor Keesom produced solid helium. But the quantity was only one cubic...
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