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Provisional Low-Temperature Scale of 2000 : ウィキペディア英語版 | Provisional Low-Temperature Scale of 2000 The Provisional Low-Temperature Scale of 2000 (PLTS-2000) is an equipment calibration standard for making measurements of very low temperatures, in the range of 0.9 mK (millikelvin) to 1 K, adopted by the International Committee for Weights and Measures in October, 2000. It is based on the melting pressure of solidified helium-3.〔 〕〔 〕 At these low temperatures, the melting pressure of helium-3 varies from about 2.9 MPa to nearly 4.0 MPa. At the temperature of approximately 315 mK, a minimum of pressure (2.9 MPa) occurs. Although this gives a disadvantage of non-monotonicity, in that two different temperatures can give the same pressure, the scale is otherwise robust since the melting pressure of helium-3 is insensitive to many experimental factors. == See also ==
* International Temperature Scale of 1990 (ITS-90) — the calibration standard used for all temperatures above 0.6 K * Leiden scale
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