Τίτλος:
James Dewar and the vanishing electrical resistance at absolute zero temperature
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
James Dewar, together with J. A. Fleming, started extensive measurements of the variation of electrical resistance with temperature in a large number of metals and alloys. The initial measurements were performed at liquid oxygen temperatures. They measured resistances down to -200°C with the large quantities of liquid oxygen that they could prepare. They found that all the lines of resistance are more or less curved lines that tend downwards in such a way as to show that if prolonged beyond -200°C they would probably pass through or near the origin of absolute zero. Dewar and Fleming planned to obtain very low temperatures by evaporating liquid oxygen boiling under reduced pressure. They also completed an exhaustive study of the resistance of mercury which could be prepared in a very pure state at liquid air temperatures and their results indicated again that the resistance of mercury would vanish at zero degrees Kelvin.
Περιοδικό:
Annalen der Physik
Λέξεις-κλειδιά:
Absolute zero; Absolute zero temperature; Air temperature; Curved lines; Electrical resistances; Liquid oxygen; Metals and alloys; Pure state; Reduced pressure; Very low temperatures, Dewars; Electric resistance; Mercury (metal); Metallurgy, Liquefied gases
DOI:
10.1002/andp.201200719
