The 1962 He3 scale of temperatures. II. Derivation

摘要: An Experimental Thermodynamic Equation (ETE) temperature scale valid from 0.2 to 2.0 °K has been calculated for He3. The is based on new comparisons, (P3, P4),of He3 and He4 vapor pressures above 0.9 °K; the 1958 scale; best available data several thermodynamic properties of °K. T62 Full-Range Working (FWE) scale, lnP3=-2.49174/T+4.80386-0.286001 T+0.198608 T2-0.0502237 T3+0.00505486 T4 +2.24846 ln T fits ETE T58) therefore use critical point, 3.324 maximum deviation 0.4 mdeg standard input 0.25 mdeg. fit seven recalculated isotherms Keller in range 1962 can be determined by converting Keller's P4's equivalent P3's, using direct P4 P3 interpolation equations. as good same isotherms, average displacements two scales both being 1.5 below isotherms. deviations (T62-Tiso) (T58-Tiso) are 1.2 1.0 mdeg, respectively, these