Ice and Water - Melting Points vs. Pressure
Melting point: The temperature at which a solid turns into a liquid.
The melting point of water is dependent of the pressure above the ice (solid water), and the melting point or freezing temperature decreases with increasing pressure. By definition 0 °C is at the melting point of water at 1 atmosphere pressure.
Online Ice to Water Melting Point Calculator
The calculator below can be used to calculate the water melting point at given pressures.
The output temperature is given as °C, °F, K and °R.
Note! Pressure must be within the ranges 0.01-2000 bara, 0.1-29 000 psia, 5-1500 000 mm Hg or 0.2-59000 in Hg.
Choose the actual unit of pressure:
See Water and Heavy Water for thermodynamic properties at standard condtions.
See also other properties of Water at varying temperature and pressure : Boiling points at high pressure , Boiling points at vacuum pressure , Density and specific weight , Dynamic and kinematic viscosity , Enthalpy and entropy , Heat of vaporization , Ionization Constant, pK w , of normal and heavy water , Prandtl number , Properties at Gas-Liquid Equilibrium Conditions , Saturation pressure , Specific gravity , Specific heat (heat capacity) , Specific volume , Thermal conductivity , Thermal diffusivity and Vapour pressure at gas-liquid equilibrium .
| Pressure | Temperature | |||||
| [MPa] | [bara] | [psia] | [mm Hg] | [in Hg] | [°C] | [°F] |
| 0.000612 | 0.00612 | 0.089 | 4.59 | 0.18 | 0.01 | 32.02 |
| 0.1 | 1.01325 | 14.7 | 750 | 29.5 | 0.0026 | 32.00 |
| 1 | 10 | 145 | 7501 | 295 | -0.064 | 31.88 |
| 2 | 20 | 290 | 15001 | 591 | -0.14 | 31.75 |
| 5 | 50 | 725 | 37503 | 1476 | -0.37 | 31.33 |
| 10 | 100 | 1450 | 75006 | 2953 | -0.75 | 30.65 |
| 15 | 150 | 2176 | 112509 | 4429 | -1.14 | 29.95 |
| 20 | 200 | 2901 | 150012 | 5906 | -1.54 | 29.23 |
| 30 | 300 | 4351 | 225019 | 8859 | -2.36 | 27.75 |
| 40 | 400 | 5802 | 300025 | 11812 | -3.21 | 26.22 |
| 50 | 500 | 7252 | 375031 | 14765 | -4.09 | 24.64 |
| 60 | 600 | 8702 | 450037 | 17718 | -5.00 | 23.00 |
| 70 | 700 | 10153 | 525043 | 20671 | -5.94 | 21.31 |
| 80 | 800 | 11603 | 600049 | 23624 | -6.91 | 19.56 |
| 90 | 900 | 13053 | 675056 | 26577 | -7.91 | 17.76 |
| 100 | 1000 | 14504 | 750062 | 29530 | -8.94 | 15.91 |
| 120 | 1200 | 17405 | 900074 | 35436 | -11.09 | 12.04 |
| 140 | 1400 | 20305 | 1050086 | 41342 | -13.35 | 7.97 |
| 160 | 1600 | 23206 | 1200099 | 47248 | -15.73 | 3.69 |
| 180 | 1800 | 26107 | 1350111 | 53154 | -18.22 | -0.80 |
| 200 | 2000 | 29008 | 1500123 | 59060 | -20.83 | -5.49 |
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