Can Thermodynamic Processes Occur at Changing Pressure and Constant Temperature?

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SUMMARY

Thermodynamic processes can indeed occur at changing pressure while maintaining constant temperature, as evidenced by the behavior of substances in the saturated liquid/vapor region on Pressure-Volume (Pv) and Pressure-Temperature (Pt) diagrams. When a substance transitions from the saturated region to the critical point under these conditions, it remains in the critical region on both diagrams despite the temperature being constant. This phenomenon is largely influenced by the presence of moisture in the vapor, which can change as the mixture heats up, leading to a conversion of moisture to gas and altering the state of the mixture.

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  • Understanding of Pressure-Volume (Pv) and Pressure-Temperature (Pt) diagrams
  • Knowledge of thermodynamic principles, particularly phase transitions
  • Familiarity with the concept of critical points in thermodynamics
  • Basic grasp of moisture content and its effects on vapor mixtures
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  • Learn about phase transitions and their representation on Pv and Pt diagrams
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Ry122
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how is it possible that processes in thermodynamics can occur at changing pressure and constant temperature and vice versa when the saturated liquid/vapour region on Pv and Pt diagrams are the same? Eg. a substance that begins from the saturated region that reaches critical point in a changing pressure process with constant temperature should be in the critical region on both the Pt and Pv diagrams should it not? but how can that be if temperature is constant and cannot move up into the critical region?
 
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Your question is unclear. However, I suspect that you may be ignoring moisture suspended in the vapor. As you heat up, more mositure is converted to gas, thus "drying out" the mixture.
 

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