Abstract
Few types of thermometry are available below 1 K, and none is sufficiently well established, readily available, or widely used in laboratories around the world. As discussed in the preceding chapters, even the ITS-90 below 1 K is affected by the degradation of the experimental data forming its basis. As far as the use of gases is concerned, the choice is restricted to 3He. In both vapor-pressure thermometry and gas thermometry, increasing experimental difficulties are encountered below 1,000 mK. In no way, can these techniques be applied much below 500 mK.
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Notes
- 1.
Note that in this chapter the prefix milli for the kelvin will normally be used, since this type of thermometry essentially extends below 1 K, in the millikelvin region of absolute temperatures.
- 2.
Note that the 5–20 mK range is not so narrow as appears at first glance, since it spans a temperature ratio T max/T min = 4, wider, for example, than the range of the ITS-90 ICVGT (3–24.6 K).
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Pavese, F., Molinar Min Beciet, G. (2013). Thermometry Based on the Melting Line of 3He. In: Modern Gas-Based Temperature and Pressure Measurements. International Cryogenics Monograph Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-8282-7_5
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DOI: https://doi.org/10.1007/978-1-4419-8282-7_5
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