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SRM 1970: Succinonitrile Triple-Point Standard-A Temperature Reference Standard Near 58.08 °C
1National Bureau of Standards, Gaithersburg, MD 20899.
Standard Reference Material (SRM) 1970 succinonitrile cells were established for accurate temperature measurements. Most cells met triple-point temperature requirements, ensuring reliable calibration for the International Practical Temperature Scale of 1968.
Area of Science:
- Metrology
- Thermometry
- Materials Science
Background:
- Accurate temperature calibration is crucial in scientific research and industry.
- Standard Reference Materials (SRMs) provide a basis for reliable measurements.
- Succinonitrile's triple point offers a stable reference temperature near 58 °C.
Purpose of the Study:
- To establish triple-point-of-succinonitrile cells as Standard Reference Material (SRM) 1970.
- To determine the suitability of succinonitrile cells for precise thermometry.
- To define the preparation, testing, and usage procedures for SRM 1970.
Main Methods:
- Testing of 115 triple-point-of-succinonitrile cells.
- Determination of triple-point temperatures through freezing point measurements.
- Purity analysis of succinonitrile used in the cells.
- Evaluation against the International Practical Temperature Scale of 1968.
Main Results:
- 109 out of 115 cells were accepted as SRM 1970.
- The mean triple-point temperature of accepted cells is 58.0796±0.0015 °C.
- The purity of succinonitrile ranged from 99.999,97% to 99.999,84%.
- A standard deviation of 0.48 mK was observed for the triple-point temperatures.
Conclusions:
- Triple-point-of-succinonitrile cells are suitable for establishment as SRM 1970.
- The established SRM provides a reliable temperature reference point.
- Detailed procedures for preparation, testing, and use ensure measurement consistency.
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