A metrology researcher whose gas-thermometry work compared thermodynamic temperature with a practical temperature scale. A constant-volume gas thermometer, precision manometer and measurements of apparatus thermal expansion supplied independent physical constraints. The comparison exposed differences between an operational calibration scale and the underlying thermodynamic quantity it was intended to represent.[ref]
NBS/NIST Gas Thermometry From 0 to 660 °C by J. F. Schooley. Abstract and pp. 255–256: apparatus and comparison with IPTS-68
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