Entropy & Work Done: Understanding Reversible Heating/Stirring

Click For Summary
SUMMARY

The discussion focuses on the relationship between entropy and work done during reversible heating and stirring of water. It establishes that while stirring (state 1 to state 2) does not involve heat transfer, a change in entropy occurs due to the temperature rise. The argument presented emphasizes that reaching the same state through reversible heating would result in a measurable change in entropy, reinforcing the concept that entropy is a state function. The second law of thermodynamics is cited to support the notion that in reversible processes, the change in the system and surroundings is zero.

PREREQUISITES
  • Understanding of the second law of thermodynamics
  • Familiarity with the concept of entropy as a state function
  • Knowledge of reversible processes in thermodynamics
  • Basic principles of heat transfer and work in thermodynamic systems
NEXT STEPS
  • Study the implications of the second law of thermodynamics in various processes
  • Explore the mathematical formulation of entropy changes in reversible processes
  • Investigate the differences between reversible and irreversible processes in thermodynamics
  • Learn about the practical applications of entropy in engineering and physical sciences
USEFUL FOR

Students and professionals in thermodynamics, physicists, and engineers interested in the principles of heat transfer and entropy in reversible processes.

pukb
Messages
94
Reaction score
1
There is a container containing water (state 1) which is being stirred. There is a temperature rise (state 2) due to stirring. It is required to find out change in entropy of the system if the process is reversible. Since, there is no heat transfer there would be no change in entropy due to external work. But the argument is, if the same state (state 2) is reached by reversible heating of the fluid instead of stirring, there would be some change in entropy. Since entropy is a state function, it would mean that there is a change in entropy while stirring also.
How does one understand this?
 
Engineering news on Phys.org
( in my opinion ) whenever, there is a change in temperature, there will be a change in entropy.

The second low of thermodynamics, says it's right that the change of the system and the surrounding is zero only because it's a reversible process (ideal).

Sorry for my poor English.
 

Similar threads

Undergrad Could entropy be reversed eventually in the far future?
  • · Replies 9 ·
Replies
9
Views
3K
Undergrad Entropy change due to heat transfer between sources
  • · Replies 15 ·
Replies
15
Views
3K
Undergrad Focus Problem for Entropy Change in Irreversible Adiabatic Process
  • · Replies 60 ·
3
Replies
60
Views
11K
Chemistry How does it work to mix two gases reversibly in this device?
  • · Replies 1 ·
Replies
1
Views
2K
Evaluation of heat and work for a stirred liquid
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Why does the entropy of a closed system remain constant in a reversible process?
  • · Replies 10 ·
Replies
10
Views
4K
Chemistry No heat exchange with the surroundings in an irreversible expansion of an ideal gas?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Could the Laws of Physics Be Proportional to Entropy?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Elementary Ideas About Entropy -- Is this textbook example correct?
  • · Replies 16 ·
Replies
16
Views
2K
High School Is it possible to boil water by stirring it?
  • · Replies 37 ·
2
Replies
37
Views
5K