Article ID: CBB000550829

The Absolute and Its Measurement: William Thomson on Temperature (2005)

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In this paper we give a full account of the work of William Thomson (Lord Kelvin) on absolute temperature, which to this day provides the theoretical underpinnings for the most rigorous measurements of temperature. When Thomson fashioned his concepts of `absolute' temperature, his main concern was to make the definition of temperature independent of the properties of particular thermometric substances (rather than to count temperature from an absolute zero). He tried out a succession of definitions based on the thermodynamics of ideal heat engines; most notably, in 1854 he gave the ratio of two temperatures as the ratio of quantities of heat taken in and given out at those temperatures in a Carnot cycle. But there were difficulties with using such definitions for experimental work, since it was not possible even to approximate an ideal Carnot engine in reality. More generally, it is not trivial to connect an abstract concept with concrete operations in order to make physical measurements possible. In the end, Thomson argued that an ideal gas thermometer would indicate his absolute temperature, and that the deviation of actual gas thermometers from the ideal could be estimated by means of the Joule-Thomson effect. However, the measurement of the Joule-Thomson effect itself required measurements of temperature, so there was a problem of circularity.

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Authors & Contributors
Chang, Hasok
Veljko Dragojlovic
Christensen, Alice R.
Karanja, Daniel
Heller-Roazen, Daniel
Chu, Pey-Yi
Journals
Notes and Records: The Royal Society Journal of the History of Science
Substantia: An International Journal of the History of Chemistry
Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics
Studies in History and Philosophy of Science
Physics in Perspective
Llull: Revista de la Sociedad Española de Historia de las Ciencias y de las Técnicas
Publishers
Princeton University
Oxford University Press
Concepts
Temperature
Physics
Thermodynamics
Measurement
Thermometers
Properties of matter
People
Kelvin, William Thomson, Baron
Joule, James Prescott
Dewar, James
Westinghouse, George
Watt, James
Poincaré, Jules Henri
Time Periods
19th century
20th century
18th century
20th century, early
17th century
Places
Tanzania (Tanganyika, Zanzibar)
Switzerland
Polar regions
Germany
France
Siberia (Russia)
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