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Question 1

2votes

2answers

190views

Callen's Thermodynamics - how can equilibrium states be specified by internal energy?

I am currently reflecting a bit on the formal structure of the theory presented in Callen's classic text Thermodynamics and an Introduction to Thermostatistics. I was originally going to post a more ...

Anna

1,253

askedNov 25 at 0:58

Question 2

2votes

1answer

236views

Orbiting ring vs orbiting body

A solid ring cannot orbit a mass at its center because it is in unstable equilibrium, and a slight perturbation would cause it to drift.An object obviously can orbit. You can also take a portion of a ...

Ariel

121

askedNov 19 at 20:47

Question 3

1vote

3answers

142views

Callen's thermodynamics - is it possible for the state of maximum entropy to lie on unphysical thermodynamic coordinates?

I have a question regarding the second edition of Callen's Thermodynamics and an Introduction to Thermostatistics, which regards his third postulate:Postulate III. [...] The entropy is continuous ...

Anna

1,253

askedNov 16 at 12:53

Question 4

2votes

1answer

109views

What is an Equilibrium State for Callen?

This question is based on Callen's book "Thermodynamics and An Introduction to Thermostatistics".My understanding is that for gases, liquids and other macroscopic systems, macroscopic ...

16π Cent

171

askedNov 8 at 17:40

Question 5

2votes

2answers

246views

How can we justify the application of (classical!) thermodynamic formalism to parts of the universe that are not isolated?

I have been studying classical thermodynamics for the past few weeks and I have a question that has been bothering me somewhat. To begin, I will pose a short thought experiment to derive a conclusion ...

Anna

1,253

askedOct 30 at 15:14

Question 6

3votes

2answers

136views

Pressure of thermal system at equilibrium

This question may sound stupid. Consider a system at equilibrium. If we use the canonical ensemble, then the pressure of the system is(if I'm right) $$p=-\sum_s {p_s \frac{\mathbb d E_s}{\mathbb d V}},...

astakus

91

askedOct 30 at 6:54

Question 7

11votes

2answers

3kviews

If you're putting a rubber band around a sphere, when does it stay on?

A little while ago, I was fidgeting with a ball and some elastic bands, and I noticed that it seems like the elastic bands have to lie along a great circle (or near one) in order to not snap off.Is ...

Chair

119

askedOct 28 at 20:17

Question 8

1vote

0answers

123views

Does the relationship $dQ=TdS$ for quasi-static processes with well-defined work function $dW=-pdV$ hold if there are changes in chemical composition?

The question can be summarized as this: is it valid, for a quasi-static process where the only mode of work is pressure-volume work, to identify $TdS$ with the quasi-static heat flux to the system ...

Anna

1,253

askedOct 26 at 20:23

Question 9

1vote

3answers

585views

Is this a valid example of a quasi-static process where the relationship $dQ=TdS$ does not hold?

After discussion with @almost_okay under this answer, I feel the need to dedicate a whole thread to the question under discussion since the comment exchange was getting quite long. I realized a ...

Anna

1,253

askedOct 24 at 17:21

Question 10

2votes

2answers

279views

Why does Callen not take into account the change in entropy of the reversible work source?

I am reading the second edition of Callen's Thermodynamics and in particular about the maximum work theorem which essentially states that a process which produces work and heat produces maximum work ...

Anna

1,253

askedOct 23 at 19:02

Question 11

0votes

2answers

402views

Why does Callen define free expansion to be non-quasistatic?

On p. 99 in Callen's Thermodynamics, there is a practice problem where one is supposed to show that for the continuous (proceeding through infinitely many transformations $V\to V+dV$) free expansion ...

Anna

1,253

askedOct 19 at 22:50

Question 12

-3votes

1answer

128views

What are the objects, that Callen keeps calling infinitesimals, formally? [duplicate]

I am currently reading the second edition of Callen's Thermodynamics and an Introduction to Thermostatics and it has become apparent to me that the objects Callen insists on calling infintesimals, ...

Anna

1,253

askedOct 15 at 18:15

Question 13

1vote

1answer

222views

Callen's Thermodynamics - what theory of infinitesimals is Callen using and how can a process with infinitesimal increments be quasi-static? [closed]

I am reading the second edition of Callen's Thermodynamics and an introduction to Thermostatics and I have a question that is tangentially related to this (1) and this (2) thread. In both threads, an ...

Anna

1,253

askedOct 14 at 11:33

Question 14

8votes

4answers

919views

Why does temperature characterize thermal equilibrium?

Thermal equilibrium between thermodynamic systems is defined as a relation that is satisfied if there isn't any net heat exchange when the systems are put in contact. The zeroth law states thermal ...

Gabriel Golfetti

2,457

askedOct 13 at 15:28

Question 15

9votes

5answers

2kviews

How could an infinitesimal transfer of heat even be possible if we already have equilibrium?

I am reading the second edition of Callen's Thermodynamics and am a little confused about an example he presents. The example is outlined below and can be found on page 101.In the simplest case we ...

Anna

1,253

askedOct 13 at 0:18

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Questions tagged [equilibrium]

Callen's Thermodynamics - how can equilibrium states be specified by internal energy?

Orbiting ring vs orbiting body

Callen's thermodynamics - is it possible for the state of maximum entropy to lie on unphysical thermodynamic coordinates?

What is an Equilibrium State for Callen?

How can we justify the application of (classical!) thermodynamic formalism to parts of the universe that are not isolated?

Pressure of thermal system at equilibrium

If you're putting a rubber band around a sphere, when does it stay on?

Does the relationship $dQ=TdS$ for quasi-static processes with well-defined work function $dW=-pdV$ hold if there are changes in chemical composition?

Is this a valid example of a quasi-static process where the relationship $dQ=TdS$ does not hold?

Why does Callen not take into account the change in entropy of the reversible work source?

Why does Callen define free expansion to be non-quasistatic?

What are the objects, that Callen keeps calling infinitesimals, formally? [duplicate]

Callen's Thermodynamics - what theory of infinitesimals is Callen using and how can a process with infinitesimal increments be quasi-static? [closed]

Why does temperature characterize thermal equilibrium?

How could an infinitesimal transfer of heat even be possible if we already have equilibrium?

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