Summary Table
A Useful Summary Table; not part of the ITS-90 text.Summary Table of Some Fixed Points
| Summary of some fixed points including effect of pressure | ||||||
| Substance | Assigned Value of equilibrium temperature T90/K | Assigned Value of equilibrium temperature t90/°C | Assigned Value of equilibrium temperature °F |
State | Temperature with pressure, p, (dT/dp)/(10-8K.Pa-1)* | Variation with depth, l, (dT/dl)/(10-3 K.m-1)** |
| e-Hydrogen | 13.8033 | -259.3467 | -434.8241 | Triple | 34 | 0.25 |
| Neon | 24.5561 | -248.5939 | -415.4690 | Triple | 16 | 1.9 |
| Oxygen | 54.3584 | -218.7916 | -361.8249 | Triple | 12 | 1.5 |
| Argon | 83.8058 | -189.3442 | -308.8196 | Triple | 25 | 3.3 |
| Mercury | 234.3156 | -38.8344 | -37.9019 | Triple | 5.4 | 7.1 |
| Water | 273.16 | 0.01 | 32.018 | Triple | -7.5 | -0.73 |
| Gallium | 302.9146 | 29.7646 | 85.5763 | Melt | -2.0 | -1.2 |
| Indium | 429.7485 | 156.5985 | 313.8773 | Freeze | 4.9 | 3.3 |
| Tin | 505.078 | 231.928 | 449.470 | Freeze | 3.3 | 2.2 |
| Zinc | 692.677 | 419.527 | 787.149 | Freeze | 4.3 | 2.7 |
| Aluminium | 933.473 | 660.323 | 1220.581 | Freeze | 7.0 | 1.6 |
| Silver | 1234.93 | 961.78 | 1763.20 | Freeze | 6.0 | 5.4 |
| Gold | 1337.33 | 1064.18 | 1947.52 | Freeze | 6.1 | 10 |
| Copper | 1357.77 | 1084.62 | 1984.32 | Freeze | 3.3 | 2.6 |
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*Equivalent to millikelvins per standard atmosphere **Equivalent to millikelvins per metre of liquid #The Reference Pressure for melting and freezing points is the standard atmosphere (p0 = 101 325 Pa). For triple points (T) the pressure effect is a consequence only of the hydrostatic head of liquid in the cell |
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