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  4. For the phase diagram of water given in figure, curves O A, A B and A C are respectively

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Q. For the phase diagram of water given in figure, curves $O A, A B$ and $A C$ are respectivelyPhysics Question Image

Thermal Properties of Matter

Solution:

The point on the sublimation curve $O A$ represents states in which the solid and vapour phases co-exist. Points on the fusion curve $A B$ represents states in which solid and liquid phase co-exist.
Points on the vaporisation curve $A C$ represents states in which the liquid and vapour phases co-exist.
Therefore, in the given graph, the curves $O A, A B$ and $A C$ are respectively sublimation curve, fusion curve and vaporisation curve.