Constant thermodynamic potentials examples

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Homework Help Overview

The discussion revolves around identifying real-world processes associated with constant thermodynamic potentials, specifically internal energy, enthalpy, Gibbs free energy, and Helmholtz free energy. Participants are exploring the implications of these conditions in physical or chemical contexts.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to identify examples for each thermodynamic potential and are questioning the physical interpretations of the conditions such as dS=0 and dP=0. There is a focus on brainstorming cases where these restrictions apply.

Discussion Status

Some participants emphasize the importance of understanding real-world examples to grasp thermodynamic concepts better. There is a recognition that providing direct answers may not facilitate learning, and suggestions are made to explore interpretations and brainstorm relevant cases instead.

Contextual Notes

Participants express a desire for real-world examples to aid their understanding, indicating a potential gap in their current knowledge or application of thermodynamic principles. There is a mention of homework rules that discourage direct answers without prior effort from the original poster.

dperkovic
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Homework Statement



Specify at least two ( physical or chemical), real world, processes for each of this cases:

a) Internal energy is constant
b) Entalpy is constant
c) Gibbs free energy is constant
d) Helmholtz free energy is constant

Homework Equations



a) dU = TdS - pDV = 0
b) dH = TdS + VdP = 0
c) dG = dH - tdS = 0, or dG =vDp -SdT = 0 ?
d) dF = -(pdV + SdT ) = 0

The Attempt at a Solution



b) Joulle-Thompson effekt

...and this is all what I found...Thanks for any help !
 
Last edited:
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It's not going to help you learn if people just provide the examples for you, so let's try this tack: what's the physical interpretation of dS=0? How about dP=0, and the others? Can you brainstorm some cases where these restrictions apply? For example, which state variables are constant when an exposed solid melts to form a liquid?
 
Mapes said:
It's not going to help you learn if people just provide the examples for you, so let's try this tack: what's the physical interpretation of dS=0? How about dP=0, and the others? Can you brainstorm some cases where these restrictions apply? For example, which state variables are constant when an exposed solid melts to form a liquid?

Maybe it is true, but I think that knowing real world examples help me to better understand thermodynamics. Than, I can compare "mathematics" with real world.
 
dperkovic said:
Maybe it is true, but I think that knowing real world examples help me to better understand thermodynamics. Than, I can compare "mathematics" with real world.
This stand for constant gibbs, am I right ?
 
dperkovic said:
Maybe it is true, but I think that knowing real world examples help me to better understand thermodynamics. Than, I can compare "mathematics" with real world.

Sorry, we don't provide answers to homework-type questions. If you show your own effort, however, you'll likely get helpful comments.
 
Mapes said:
Sorry, we don't provide answers to homework-type questions. If you show your own effort, however, you'll likely get helpful comments.

I'll try, thank you anyway
 

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