Thermometry Based on the Melting Line of 3He
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 1000 mK. In no way can these techniques be applied much below 500 mK.
KeywordsThermodynamic Temperature Melting Line Superfluid Phasis Thermal Boundary Resistance Preceding Chapter
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