Question about the Zeroth law of thermodynamics and Equlibrium

Click For Summary
SUMMARY

The discussion centers on the Zeroth Law of Thermodynamics and the implications of separating two systems in equilibrium using an adiabatic wall. When systems A and B, initially in equilibrium, are separated, their state variables—such as temperature, pressure, and volume—can change depending on the surrounding conditions. The conversation highlights the importance of understanding state variables, as they describe the system's state and can drift apart if there is a net flow of mass or energy after separation. The reference to "Heat and Thermodynamics" by M. W. Zemansky underscores the foundational concepts being discussed.

PREREQUISITES
  • Understanding of the Zeroth Law of Thermodynamics
  • Familiarity with state variables (temperature, pressure, volume)
  • Knowledge of adiabatic processes
  • Basic principles of thermodynamic equilibrium
NEXT STEPS
  • Study the implications of the Zeroth Law of Thermodynamics in practical applications
  • Explore adiabatic processes in thermodynamics
  • Research the concept of state variables in thermodynamic systems
  • Examine the effects of energy and mass flow on system equilibrium
USEFUL FOR

Students of thermodynamics, physicists, and engineers interested in the principles of equilibrium and thermodynamic processes.

MatinSAR
Messages
673
Reaction score
204
TL;DR
Question about zero law of thermodynamics and equilibrium
I know that if 2 systems A and B are in equilibrium their coordinates doesn't change. Systems are not complicated and be fully described using two separated coordinates X and Y.

What will happen if I seprate them using an adiabatic wall? Their coordinates start to change but I cannot understand why.
 
Science news on Phys.org
I don't understand your use of the word "coordinates" here. Can you expand?
 
  • Like
Likes   Reactions: MatinSAR
DrClaude said:
I don't understand your use of the word "coordinates" here. Can you expand?
I've read about them in "Heat and Thermodynamics by M. W. Zemansky".
By coordinates I meant quantities that describe a state of a system like: Temperature, Pressure, Volume.

1700219549454.png


Edit : Adding a picture of the book.
 
Last edited:
  • Like
Likes   Reactions: Dale
Interesting, I know these as 'state variables', not coordinates.

If you separate two systems that are at first in equilibrium, then their state may or may not drift away from each other. This depends entirely on the surroundings they are in. If there is a net flow of mass or energy over the surface by which you separate the system, then this energy or mass flow stops after the separation. This will then influence the state of both systems, and their respective states will likely drift away from each other.
 
  • Like
Likes   Reactions: DrClaude and MatinSAR
Arjan82 said:
If you separate two systems that are at first in equilibrium, then their state may or may not drift away from each other. This depends entirely on the surroundings they are in.
I understand ... Thank you.
 

Similar threads

Replies
5
Views
649
  • · Replies 135 ·
5
Replies
135
Views
8K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 22 ·
Replies
22
Views
6K
  • · Replies 60 ·
3
Replies
60
Views
10K
  • · Replies 1 ·
Replies
1
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K