Question about the Zeroth law of thermodynamics and Equlibrium

In summary, the Zeroth law of thermodynamics establishes the concept of thermal equilibrium, stating that if two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other. This foundational principle allows for the definition of temperature and is crucial for understanding thermal interactions and equilibrium states in thermodynamic systems.
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MatinSAR
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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.
 
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I don't understand your use of the word "coordinates" here. Can you expand?
 
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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.

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Edit : Adding a picture of the book.
 
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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.
 
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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.
 

FAQ: Question about the Zeroth law of thermodynamics and Equlibrium

What is the Zeroth Law of Thermodynamics?

The Zeroth Law of Thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. This law essentially defines temperature and forms the basis for the concept of thermal equilibrium.

Why is it called the Zeroth Law?

It is called the Zeroth Law because it was formulated after the First and Second Laws of Thermodynamics were already established. However, it was recognized that this principle needed to be stated first as it underpins the concept of temperature and thermal equilibrium, hence it was given a foundational position as the "Zeroth" law.

How does the Zeroth Law of Thermodynamics relate to temperature measurement?

The Zeroth Law of Thermodynamics is fundamental to the concept of temperature. It allows us to use thermometers to measure temperature by ensuring that if a thermometer is in thermal equilibrium with a system, it will give a consistent and reliable measurement of the system's temperature.

What is thermal equilibrium?

Thermal equilibrium is a condition where two systems in contact with each other do not exchange heat, meaning they are at the same temperature. When two systems are in thermal equilibrium, their properties remain constant over time, given no external changes.

Can the Zeroth Law of Thermodynamics be applied to non-physical systems?

While the Zeroth Law is primarily concerned with physical systems and thermal equilibrium, the concept of equilibrium can be extended metaphorically to other fields such as economics or biology. However, the precise application and implications would differ from the strict thermodynamic context.

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