Provisional Low Temperature Scale of 2000

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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.[1]:11.3[2][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.

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References[edit]

  1. ^ Pobell, F. (2007). Matter and Methods at Low Temperatures (3rd ed.). Springer. ISBN 978-3-540-46356-6. 
  2. ^ "The Provisional Low Temperature Scale from 0.9 mK to 1 K, PLTS-2000" (PDF). International Bureau of Weights and Measures. Retrieved December 2013.  Check date values in: |access-date= (help)
  3. ^ "Supplementary Information for the ITS-90". International Bureau of Weights and Measures. Retrieved December 2013.  Check date values in: |access-date= (help)