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Triple point is a point on the phase diagram representing a particular pressure and temperature at which the solid, liquid, and vapour can co-exist in equilibrium.

For water the values of pressure and temperature corresponding to Triple point are 4.58 mm of hg(610.42pa),273.16K.

There are three lines drawn on the phase diagram.

They are:

1. Ice Line

2. Steam Line

3. Hoar Frost Line

1. Ice Line: The line PB is called Ice Line.Along the line PB the solid and water are said to be equilibrium.

2. Steam Line: The line PA is called Steam line.Along the line PA the water and steam are said to be equilibrium.

3. Hoar Frost Line: The line PC is called Sublimation line (or) Hoar Frost Line.Along the line PC the Ice and Steam are in equilibrium.

The Intersection of these three lines is Triple point.

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13y ago

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