Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
We provide the primary (defined) fixed points on the International Temperature Scale of 1990 (ITS-90) along with uncertainties. We provide the primary references for all primary fixed points. In addition, to this primary reference, we also provide OTHER references (generally multiple) to the literature for these primary fixed points in the menu item References for Temperature Points.
Instruction:Substance | Transition | T90 (K)
| u(T90) (mK) | T-T90 (mK) | u(T-T90) (mK) | Squib |
More Data |
|---|---|---|---|---|---|---|---|
| He | VP | 0.65 to 5.0 | <1 | |T-T90|<2 | <1 | manage_search | |
| H2 | TP | 13.8033 | 0.15 | 0.36 | 0.01 | manage_search | |
| e-H2 | VP1 | 17.035 | 0.15 | 0.29 | 0.01 | manage_search | |
| e-H2 | VP2 | 20.27 | 0.15 | 0.16 | 0.01 | manage_search | |
| Ne | TP | 24.5561 | 0.09 | -0.06 | 0.2 | manage_search | |
| O2 | TP | 54.3584 | 0.06 | -2.21 | 0.14 | manage_search | |
| Ar | TP | 83.8058 | 0.06 | -4.21 | 0.15 | manage_search | |
| Hg | TP | 234.3156 | 0.2 | -2.89 | 0.13 | manage_search | |
| H2O | TP | 273.16 | 0 | 0.1 | 0.1 | manage_search | |
| Ga | MP | 302.9146 | 0.2 | 3.84 | 0.34 | manage_search | |
| In | FP | 429.7485 | 0.8 | 10.1 | 0.8 | manage_search | |
| Sn | FP | 505.078 | 0.6 | 11.5 | 1.3 | manage_search | |
| Zn | FP | 692.677 | 0.8 | 13.8 | 6.9 | manage_search | |
| Al | FP | 933.473 | 2 | 28.7 | 6.6 | manage_search | |
| Ag | FP | 1234.93 | 4 | 46.2 | 14 | manage_search | |
| Au | FP | 1337.33 | 25 | 39.9 | 20 | manage_search | |
| Cu | FP | 1357.77 | 25 | 52.1 | 20 | manage_search |
