| Critical point
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Triple point
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| The point at which saturated liquid and saturated vapour lines meet is called the critical point
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The point at which fusion line and sublimation line and vapourisation meet is called the triple point
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| It is represented by a point on p-v-T surface
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It is represented by a point on p-T diagram but appears as a line on p-v-T surface
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| At critical point there is no distinction between the liquid and vapour phases . below critical point the substances exists in a two phases
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At triple point all the three phases can coexist together in equilibrium
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