The Japan Society of Calorimetry and Thermal Analysis
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The challenge of determining the last two digits of absolute zero temperature attracted several groups of
researchers around the world in the first half of the 20th century. It is little known that Japanese researchers, Jiro Oishi
and Masao Kinoshita, were the ones who successfully settled the dispute over these two digits. Their work played a
key role in defining the zero point on the thermodynamic temperature scale, and thus later in defining the unit of
thermodynamic temperature, the kelvin, in terms of the absolute zero and the triple point of water. This current
definition of kelvin is scheduled to be redefined based on the Boltzman constant. On the occasion of this turning point
of the definition of the kelvin, it may be timely to reflect on the historic milestone work of Oishi and Kinoshita. The
background and current status for changing the definition are also described.
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