Abstract
THE temperature coefficient of electrical resistance between 0° C. and 100° C., (R100–R0)/100 R0 is an accepted criterion of the purity of platinum. Very high-purity platinum, such as is used in the manufacture of resistance thermometers and thermocouples, has a temperature coefficient approaching 0.003927, and this represents the purest platinum commercially available. For rhodium, the other element used in standard thermocouples, the temperature coefficient of electrical resistance is not at present used for assessment of purity, but measurements made by us indicate that it might be a useful criterion for this metal also. The highest value recorded in the literature1 for the temperature coefficient of electrical resistance, between 0° C. and 100° C., for high-purity rhodium is 0.00457.
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