Question
Download Solution PDFThe fusion curve on the P-T diagram for all substances possesses the following slope
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Fusion is a solid to a liquid phase transition.
For water, v” < v’ (Indicating contraction) \(\Rightarrow \;\frac{{dp}}{{dT}} \to - ve\)
For most other substances v” > v’ (expansion) \( \Rightarrow \;\frac{{dp}}{{dT}} \to + ve\)
Important Points
- The fusion curve has been drawn with a positive slope, which is typically the case.
- The fusion curve of ice/water has a negative slope due to the fact that when ice melts, the molar volume decreases.
- Ice actually melts at a lower temperature at a higher pressure
Therefore, The slope of the curve is positive as well as negative hence, it is actually variable in nature.
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