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Draw the phase diagram of one component water system. Explain triple point.
1 Answer
written 3.3 years ago by |
For any one-component system, the maximum number of degrees of freedom is two. Therefore, such a system can be represented completely by a two-dimensional diagram.
The most convinient variables are the pressure and the temperature.
(i) Curves:
(ii) Triple Point:
The three curves OA, OB and OC meet at 0, at which solid, liquid and vapour are simultaneously at equilibrium. the point at 273.16°K is called a triple point. Since three phases co-exist, the system is invariant. In other words, there is no Degree of Freedom at 0, i.e. neither pressure nor temperature can be altered, even slightly, without causing the disappearance of one of the phases.