| Table 2. Effect of pressure on the temperatures of some defining fixed points# | |||
| Substance | Assigned Value of equilibrium temperature T90/K | Temperature with pressure, p, (dT/dp)/10-8K.Pa-1)* | Variation with depth, l, (dT/dl)/10-3 K.m-1)** |
| e-Hydrogen (T) | 13.8033 | 34 | 0.25 |
| Neon (T) | 24.5561 | 16 | 1.9 |
| Oxygen (T) | 54.3584 | 12 | 1.5 |
| Argon (T) | 83.8058 | 25 | 3.3 |
| Mercury (T) | 234.3156 | 5.4 | 7.1 |
| Water (T) | 273.16 | -7.5 | -0.73 |
| Gallium | 302.9146 | -2.0 | -1.2 |
| Indium | 429.7485 | 4.9 | 3.3 |
| Tin | 505.078 | 3.3 | 2.2 |
| Zinc | 692.677 | 4.3 | 2.7 |
| Aluminium | 933.473 | 7.0 | 1.6 |
| Silver | 1234.93 | 6.0 | 5.4 |
| Gold | 1337.33 | 6.1 | 10 |
| Copper | 1357.77 | 3.3 | 2.6 |
|
*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 | |||