NIST Standard Reference Database (SRD) 60

NIST Temperature Scale Database (SRD 60), Version 3.0

ITS-90 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:

Click on the hyperlink in the column for more information.

Total Records: 132

Substance	Transition	T₉₀ (K)	u(T₉₀) (K)	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

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NIST Temperature Scale Database (SRD 60), Version 3.0

ITS-90 Secondary Reference Points:

International Temperature Scale Secondary Reference Points

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