Magazine article Science News

American and Dutch Physicists Reach New Low Temperature

Magazine article Science News

American and Dutch Physicists Reach New Low Temperature

Article excerpt

The greatest cold produced and measured by man has now been pushed to within a quarter of a degree of absolute zero, that unattainable heatless point where all motion of the molecules cease and where gas would exert no pressure whatever.

Two groups of research workers, one at the University of California and the other in Holland, using novel methods identical in principle, have arrived at the extraordinary low temperatures of 0.25 degrees absolute and "certainly below 0.27 degrees absolute," respectively.

The University of California scientists are Drs. W.F. Giauque and D.P. MacDougall, while the Dutch scientists are Prof. W.J. de Haas and E.C. Wiersma of Leyden and Prof. H.A. Kramers of Utrecht. The Americans did their work earlier and published first, and so they now hold the record.

Dr. Heike Kamerlingh Onnes, the pioneer in low temperature research who worked at Leyden, Holland, used the method of lowering temperature by reducing the vapor pressure of liquid helium. …

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