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Mercury-in-Glass Thermometers for Precise Temperature Measurements Near 0°C

  • T. E. Osterkamp (a1)

Abstract

Experience with the calibration and field use of mercury-in-glass calorimeter thermometers provides an indication of the accuracy attainable and the necessary corrections to obtain that accuracy. Secular changes as large as 57 mK have been observed during the first three years of thermometer use. Light physical tapping is found to reduce the thermometer readings by 3–6 mK. Corrections for variations in the external and internal bulb pressure and care to avoid parallax are necessary to obtain the best accuracy in field measurements. The best accuracy obtainable with these thermometers for temperature measurements near 0°C is approximately ±4 mK for laboratory measurements and ±5 mK for field measurements.

Résumé

Une expérience pour le calibrage et l’utilisation sur le terrain de thermomètres à mercure en verre donne des indications sur la précision accessible et les conditions nécessaires pour atteindre cette précision. Une variation séculaire de l’ordre de 57 mdeg a été observée au cours des trois premières années de l’utilisation d’un thermomètre. On constate que de petits tapotements réduisent l’indication du thermomètre de 3 à 6 mdeg. Des corrections en fonction des variations de pression externe et interne dans le réservoir du thermomètre et des soins pour éviter les erreurs de parallaxe sont nécessaires pour obtenir la meilleure précision dans les mesures de terrain. La meilleure précision accessible avec ces thermomètres pour mesurer des températures voisines de 0°C est approximativement de ±4 mdeg en laboratoire et de ±5 mdeg sur le terrain.

Zusammenfassung

Erfahrungen mit der Eichung und dem Feldgebrauch von Quecksilber–Glasthermometern vermitteln einen Eindruck von der erreichbaren Genauigkeit und den notwendigen Korrekturen für eine solche Genauigkeit. Während der ersten drei Jahre des Thermometergebraurhs wurden säkulare Änderungen bis zu 57 Milligrad beobachtet. Beichtes Klopfen kann die Thermometerablösung um 3–6 Milligrad verringern. Korrekturen für Änderungen im äusseren und inneren Kugeldruck und Vermeidung von Parallaxen sind notwendig, um höchste Genauigkeit bei Feldmessungen zu erhalten. Mit diesen Thermometern lässt sieh bei Messungen um 0°C eine maximale Genauigkeit von etwa ±4 Milligrad im Labor und von ±5 Milligrad im Feld erreichen.

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Copyright

References

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Beattie, J. A., and others. 1938. An experimental study of the absolute temperature scale. V. By Beattie, J. A., Huang, T.-C., and Benedict, M.. Proceedings of the American Academy of Arts and Sciences, Vol. 72, p. 13755.
Hall, J. A., and Leaver, V. M. 1962. Some experiments in mercury thermometry. (In American Institute of Physics. Temperature: its measurement and control in science and industry. Vol. 3, Pt. 1. New York, Reinhold, p. 23143.)
Wise, J. A. 1976. Liquid-in-glass thermometry. NBS Monograph (Washington, D.C.) 150.

Mercury-in-Glass Thermometers for Precise Temperature Measurements Near 0°C

  • T. E. Osterkamp (a1)

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