Isobaric evaporation, why the temperature must be constant?

Click For Summary
SUMMARY

In isobaric evaporation, the temperature remains constant due to the principle that when pressure (P) is held steady, temperature (T) must also stabilize to maintain equilibrium. The discussion highlights the relationship between pressure and temperature in the context of a Mollier Diagram, emphasizing that evaporation leads to cooling of the remaining liquid, which can disrupt this balance. Therefore, to accurately measure and analyze isobaric evaporation, it is essential to control the temperature alongside the pressure.

PREREQUISITES
  • Understanding of thermodynamic principles, specifically isobaric processes.
  • Familiarity with Mollier Diagrams and their applications in thermodynamics.
  • Knowledge of phase changes and their effects on temperature and pressure.
  • Basic grasp of heat transfer concepts related to evaporation.
NEXT STEPS
  • Study the principles of isobaric processes in thermodynamics.
  • Explore the construction and interpretation of Mollier Diagrams.
  • Investigate the effects of evaporation on liquid temperature and pressure dynamics.
  • Learn about heat transfer mechanisms during phase changes in liquids.
USEFUL FOR

Students in thermodynamics, engineers working with fluid systems, and anyone studying phase change phenomena in chemistry and physics.

Proust
Messages
8
Reaction score
0

Homework Statement



In case of an isobaric evaporation, why the temperature must be constant?

Homework Equations



I'm working on Mollier Diagram and my textbook says "because P is constant, so T is also constant", I coundn't understand it anyway

The Attempt at a Solution

 
Physics news on Phys.org
I'm just guessing, but ...

if you allow a solvent to evaporate (say isobaric conditions), then by evaporating I think it will cool the remaining liquid, and this will change the conditions. So I'd say as well as maintaining pressure constant, you need to take steps to ensure the temperate of the liquid is held constant to make meaningful measurements.
 

Similar threads

Change in the energy content of an isobaric process
  • · Replies 2 ·
Replies
2
Views
2K
Isobaric and Isochoric Process Combined
  • · Replies 8 ·
Replies
8
Views
4K
Isothermal, isobaric and adiabatic
  • · Replies 6 ·
Replies
6
Views
2K
Ideal gas through Isobaric process
  • · Replies 3 ·
Replies
3
Views
3K
How to Calculate ΔU and ΔH for CO2 Heated Isobarically?
  • · Replies 8 ·
Replies
8
Views
2K
Calculate area of PV diagram. Two isotherms, two isobars
  • · Replies 6 ·
Replies
6
Views
2K
Heat required to increase the temperature
  • · Replies 4 ·
Replies
4
Views
2K
Isobaric Process: Finding Q, E, W.
  • · Replies 1 ·
Replies
1
Views
7K
How do I calculate work and heat in a PV diagram for an ideal monoatomic gas?
  • · Replies 11 ·
Replies
11
Views
2K
Why Does Liquid Cool During Evaporation?
  • · Replies 3 ·
Replies
3
Views
6K