Parameters

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aCPVz= CONSTANTpARAMETERvariable.
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The number of degrees of freedom is the number of thermodynamic parameters such as temperature or pressure that can be varied simultaneously and arbitrarily without determining one another.
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Pure water boils at 100°C if the pressure is one atmosphere. If the pressure is lower than one atmosphere, pure water will boil at a temperature below 100°C. If the pressure is higher than one atmosphere, pure water will boil at a temperature higher than 100°C.
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A system consisting of water vapor in equilibrium with liquid water has only one degree of freedom. The pressure OR the temperature can be fixed. Fixing one will automatically determine the other.But a one component system like the triple point of H2O has no degrees of freedom when three phases are in equilibrium (F=0).The system is invariant.
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Water exists simultaneously in three states when we add ice to hot tea. At the triple point, the total amount of ice, water, and water vapor will not change without a change in temperature and/or pressure. Therefore, on average, the liquid will not freeze or evaporate, the ice will not melt or evaporate, and the water vapor will remain water vapor.At the triple point of H2O, ice, water, and steam are in equilibrium.
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The triple point of water is at 273.16 K and 612 Pa.
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