pressure melting point is the temperature at which ice melts at a given pressure. The melting point of the pressure is almost constant 0 ° C at pressure above the triple point at 611.7 Pa, where water can only exist in solid or liquid phase, through atmospheric pressure (100 kPa) to about 10 MPa. With increasing pressure above 10 MPa, the melting point of the pressure decreases to a minimum of -21.9 ° C at 209.9 MPa. After that, the melting point of the pressure increases rapidly with pressure, passing back through 0 ° C at 632.4 MPa.
Video Pressure melting point
Melting pressure point on glacier
Glaciers are subject to geothermal heat flux from below and atmospheric heating or cooling from above. When the pressure increases with depth in the glacier from the ice weight above, the melting point of the pressure drops in the limit, as shown in the diagram. The rate at which ice can begin to melt is where the melting point of the pressure equals the actual temperature. In a static equilibrium condition, this will be the highest level at which water can be on the glacier. This will also be the base level of the ice shelf, or the ice water interface of the subglacial lakes.
Maps Pressure melting point
References
Source of the article : Wikipedia
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