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| Study on the Development and Reproducibility of Bromobenzene Melting Point |
| YANG Yue1,CHEN Le1,SUN Jian-ping2,LI Ting2,HAO Xiao-peng2,RUAN Yi-ming1 |
1. College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China |
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Abstract The apparatus of bromobenzene melting point is developed for the on-site calibration of platinum resistance thermometers. The supercooling characteristics and melting point of bromobenzene are investigated. In addition, the methods of curve fitting and tangent intersection are compared for melting point temperature determination. Finally, the practicability of bromobenzene melting temperature plateau for the on-site calibration is analyzed and some recommendations for the use of bromobenzene melting point are also put forward. The experiments show that when the holding temperature for the bromobenzene before freezing procedure is closer to its freezing point temperature, the degree of the supercooling is smaller. During the melting procedure, when the holding temperature is warmer, the heating rate becomes larger, the width of the melting curve becomes wider and the maintenance time of the melting temperature plateau becomes shorter; When the holding temperature during melting procedure is set to -30℃, the melting plateau of bromobenzene can last for more than 6hours. By caluculation, the reproducibility of the inflection point is better than 2.5mK, and the average melting point of bromobenzene is -30.8301℃, which can meet the demand of on-site calibration requirements of industrial platinum resistance thermometer.
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Received: 30 October 2020
Published: 23 February 2022
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2022, Vol. 43 
