Explanation of Triple Point Cells with Dr R. L. Rusby of Britain’s National Physical Laboratory (NPL) in a nearly 10 minute video from YouTube. This is the first in a series of several excellent videos online that deal with this fundamental calibration point in establishing and reproducing practical calibrations.
The meaning of the triple point of matter is explained very well, with several examples, on Wikipedia at: http://en.wikipedia.org/wiki/Triple_point and the triple point of water is perhaps most succinctly described in the IUPAC * “Gold Book“** at: http://goldbook.iupac.org/K03374.html
Graph illustrating the pressure-temperature conceptional relationship of the states of matter, in general, showing the triple point and the critical points and their relation with the phases or states of matter (From the Wikipedia article: http://en.wikipedia.org/wiki/Triple_point).
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*IUPAC is the International Union of Pure and Applied Chemistry (The International Union of Pure and Applied Chemistry serves to advance the worldwide aspects of the chemical sciences and to contribute to the application of chemistry in the service of Mankind. As a scientific, international, non-governmental and objective body, IUPAC can address many global issues involving the chemical sciences.)
**IUPAC. Compendium of Chemical Terminology, 2nd ed. (the “Gold Book“). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
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