Abstract
A new temperature scale in the range from 1 to 20 degrees K has been developed by T. C. Cetas and Clayton A. Swenson of Ames Laboratory and Iowa State University. The new scale, which is preserved for use by germanium resistance thermometers, is based on precise susceptibility measurement of two paramagnetic salts, chromic methyl‐ammonium alum and manganous ammonium sulfate. Based on the National Bureau of Standards 1955 platinum resistance thermometer scale, the Iowa scale is believed to be accurate to better than 1 millidegree K over the specified range.
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