NIST Temperature Scale Database (SRD 60), Version 3.0

ITS-90 Secondary Reference Points:

Temperature Scale Points
Secondary Reference Points

International Temperature Scale Secondary Reference Points

We provide here recommended secondary reference points phase-transition temperatures for use as companion fixed points on ITS-90, along with uncertainties. We also provide references (generally multiple) to the literature for all secondary reference points. These data and references are provided in the section References for Temperature Points.

Instruction:Total Records:   132
Substance
Transition
T90 (K)
u(T90) (K)
Squib
More Data
Zn SC 0.8500 0.0030 manage_search
Al SC 1.181 0.003 manage_search
4He SF 2.1768 0.0008 manage_search
In SC 3.4145 0.0025 manage_search
He BP 4.2238 0.0001 manage_search
Pb SC 7.1997 0.0025 manage_search
Nb SC 9.288 0.003 manage_search
p-H2 TP 13.8033 na manage_search
n-H2 TP 13.952 0.002 manage_search
o-H2 TP 14.008 na manage_search
e-D2 TP 18.6889 0.0003 manage_search
n-D2 TP 18.724 na manage_search
p-H2 BP 20.271 na manage_search
n-H2 BP 20.3689 0.0034 manage_search
o-H2 β-γ 20.38 na manage_search
Methane α-β 20.45 0.01 manage_search
e-D2 BP 23.66 0.03 manage_search
O2 (α-β)' 23.814 0.008 manage_search
O2 α-β 23.89485 0.00006 manage_search
Ne-20 TP 24.5406 0.0006 manage_search
Ne BP 27.100 0.003 manage_search
N2 α-β 35.614 0.006 manage_search
O2 β-γ 43.7991 0.0015 manage_search
N2 TP 63.1507 0.0001 manage_search
N2 BP 77.3550 0.0008 manage_search
Ar MP 83.814 na manage_search
Propane TP 85.52 0.01 manage_search
Ar BP 87.303 0.002 manage_search
O2 BP 90.1878 0.005 manage_search
O2 CP 90.197 0.001 manage_search
Ethane TP 90.36 0.06 manage_search
Methane TP 90.6941 0.0025 manage_search
Chlorotrifluoromethane TP 92 na manage_search
Ethylene TP 103.986 na manage_search
Methane BP 111.668 0.0025 manage_search
Kr TP 115.775 0.001 manage_search
Kr BP 119.735 0.013 manage_search
Fluoroethane TP 130 na manage_search
1,1-Difluoroethane TP 154.56 na manage_search
1,1,1-Trifluoroethane TP 161.34 na manage_search
Xe TP 161.4059 0.0003 manage_search
Trichlorofluoromethane TP 162.678 0.002 manage_search
Xe BP 165.068 0.001 manage_search
Ethylene BP 169.379 0.004 manage_search
1,1,1,2-Tetrafluoroethane TP 169.85 na manage_search
Pentafluoroethane TP 172.52 na manage_search
Hexafluoroethane TP 173.1 na manage_search
Ethane BP 184.5686 0.0009 manage_search
Acetylene BP 188.26 na manage_search
Chlorotrifluoromethane BP 191.674 0.009 manage_search
Acetylene TP 191.75 na manage_search
CO2 SP 194.685 0.003 manage_search
Hexafluoroethane BP 195.06 0.03 manage_search
CO2 TP 216.5909 0.0004 manage_search
SF6 TP 223.5561 0.0004 manage_search
Pentafluoroethane BP 225.06 0.01 manage_search
1,1,1-Trifluoroethane BP 225.909 0.011 manage_search
Propane BP 231.036 0.002 manage_search
Hg FP 234.3210 0.0005 manage_search
Fluoroethane BP 235.61 0.02 manage_search
Bromobenzene TP 242.426 0.010 manage_search
1,1,1,2-Tetrafluoroethane BP 247.076 0.002 manage_search
1,1-Difluoroethane BP 249.127 0.011 manage_search
H2O IP 273.15 <0.0001 manage_search
Benzene TP 278.674 na manage_search
GaIn - 20.5% eut 288.800 0.001 manage_search
GaSn - 8% eut 293.626 0.002 manage_search
Diphenylether TP 300.014 0.001 manage_search
Ga TP 302.9166 0.0001 manage_search
Ethylene Carbonate TP 309.465 0.001 manage_search
Icosane TP 309.63 0.01 manage_search
Rb TP 312.453 0.002 manage_search
Succinonitrile TP 331.215 0.002 manage_search
Benzene BP 353.219 0.03 manage_search
Na FP 370.944 0.005 manage_search
H2O BP 373.124 0.001 manage_search
H2O BP 373.1243 0.0035 manage_search
Benzoic Acid TP 395.486 0.002 manage_search
Benzoic Acid FP 395.508 0.005 manage_search
In TP 429.8038 0.0004 manage_search
Li-C eut 438 3 manage_search
Bi FP 544.553 0.001 manage_search
Cd FP 594.2186 0.0002 manage_search
Pb FP 600.612 0.001 manage_search
Hg BP 629.811 0.004 manage_search
S BP 717.674 0.002 manage_search
CuAl - 66.9% eut 821.308 0.010 manage_search
AgAl - 30% eut 840.957 0.002 manage_search
Sb FP 903.778 0.001 manage_search
CuAg - 71.9% eut 1052.78 0.05 manage_search
NaCl FP 1075.168 0.011 manage_search
Na BP 1156.09 0.05 manage_search
Cu-C peri 1373 1 manage_search
Fe3C-C eut(th) 1427.02 0.08 manage_search
Co-C eut(th) 1597.48 0.06 manage_search
Ni-C eut 1602.17 0.14 manage_search
Mn7C3-C peri 1603.87 0.2 manage_search
Si-SiC eut 1679.9 0.1 manage_search
Li2O MP 1711 5 manage_search
Ni FP 1728 1 manage_search
1 2