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THE MELTING POINT OF TIN

THE MELTING POINT OF TIN,Chunjia Li

THE MELTING POINT OF TIN   (Citations: 4)
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The benefits of using the melting point of tin (MPT) rather than its freezing point as a tem- perature fixed point are discussed. A procedure for the realization of the MPT with high ac- curacy was developed. An improved procedure for inducing the freeze by using outside-gas-flow cooling is also described. The calibration data obtained from the MPT are compared with that from the freezing point of tin. Thirteen SPRTs were calibrated on eight- een pairs of freezing curves and melting curves. The average difference between the melt- ing point and freezing point was found to be -0.33 mK. The MPT can, therefore, be used to calibrate SPRTs instead of the freezing point of tin in the situations where an expanded un- certainty (k=2) of about 1.5 mK or larger is acceptable, which satisfies most requirements for SPRT calibrations.
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