Along the ‘triple line’ in a p – v diagram showing all three phase of water, which one of the following statements is correct?

Along the ‘triple line’ in a p – v diagram showing all three phase of water, which one of the following statements is correct? Correct Answer A substance has the same pressure and temperature but different specific volume

Explanation:

• The Triple point is a line on the P-V diagram where all the three phases solid, liquid and gases exist in equilibrium. At a pressure below the triple point line, the substance cannot exist in the liquid phase and the substance when heated, transforms from solid to vapour by absorbing the latent heat of sublimation from the surroundings.
• The triple point is merely the point of intersection of the sublimation and vaporization curves. It has been found that on a ‘p-T’ diagram the triple point is represented by a point and on a ‘p-v’ diagram it is a line, and on a ‘u-v’ diagram it is a triangle. In the case of ordinary water, the triple point is at a pressure of 4.58 mm Hg and a temperature of 0.01°C.

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