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4 lis 2012 · Ice and Water - Melting Points vs. Pressure. Online calculator, figures and tables with melting points of ice to water at pressures ranging from 0 to 29000 psia (0 to 2000 bara). Temperature given as °C, °F, K and °R. Melting point: The temperature at which a solid turns into a liquid.
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4 lis 2012 · Online calculator, figures and tables showing boiling points of water at pressures ranging from 14.7 to 3200 psia (1 to 220 bara). Temperature given as °C, °F, K and °R.
Pressure melting point. In this log-lin pressure-temperature phase diagram of water, the pressure melting point for a given pressure lies along the black line rising from the solid/liquid/vapour triple point along the 0 °C vertical line.
Up to 99.63 °C (the boiling point of water at 0.1 MPa), at this pressure water exists as a liquid. Above that, it exists as water vapor. Note that the boiling point of 100.0 °C is at a pressure of 0.101325 MPa (1 atm), which is the average atmospheric pressure.
If you decrease the pressure, the freezing point of water will increase ever so slightly. From 0° C at 1 atm pressure it will increase up to 0.01° C at 0.006 atm. This is the triple point of water. At pressures below this, water will never be liquid.
In order to make the equations for the melting and sublimation pressures consistent with the IAPWS-95 formulation and the ice Ih equation of state, new equations for the melting pressure and sublimation pressure of ice Ih were developed.
We can use the phase diagram to identify the state where water exists under specific temperature and pressure conditions. For example, water is ice at 50 kPa and – 10 o C. Water is unique compared to other substances.
