If pressure is elevated on a substance existing at its triple point, what happens to that triple point__________________?
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Answer: C. Remains unchanged
Explanation
The triple point of a substance occurs at a fixed unique temperature and pressure. Three distinct phases coexist in thermodynamic equilibrium only at these exact coordinates. Changing external pressure alters the phase boundaries but does not shift the triple point. Phase rules dictate that a pure substance triple point has zero degrees of freedom. Solid liquid and vapor phases exist simultaneously at the unique triple point condition. Water triple point is a fundamental reference standard for establishing temperature scales.
Metrologists use the water triple point cell to calibrate precision laboratory thermometers. Phase diagrams clearly mark the triple point as an invariant intersection on coordinate axes. Cryogenic engineering applications reference triple points to prevent unwanted phase freezing. Increasing contradicts the invariant nature of thermodynamic triple point coordinates. Decreasing is false because the triple point pressure and temperature are fixed constants. Stating it may vary ignores the strict zero degrees of freedom rule for pure substances.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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