Calculating change in entropy with °C or K.

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Homework Help Overview

The discussion revolves around calculating the change in entropy in a thermodynamic context, specifically related to a cyclic process represented in the PV plane. The original poster is uncertain about the appropriate temperature units to use in the entropy equation.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster questions whether to convert temperature from Celsius to Kelvin when applying the entropy equation. Some participants affirm the necessity of this conversion, while others clarify that Celsius can be used for calculating temperature differences.

Discussion Status

The discussion is active, with participants providing guidance on the use of temperature units in the context of entropy calculations. There is a mix of interpretations regarding the use of Celsius and Kelvin, but no explicit consensus has been reached.

Contextual Notes

The original poster's data is provided in Celsius, which raises questions about unit conversion in the context of the homework assignment. There may be specific homework rules regarding the use of temperature units that are not fully detailed in the discussion.

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Homework Statement

[/B]
I was given a graph in the PV plane of a cyclic process and asked to find some quantities, one of them is the change in entropy for the system. I just had a question about the units.

Homework Equations


dS = CVln(Tf/Ti)

The Attempt at a Solution


The data was given in Celsius, should I convert to kelvin when I put it into this equation?
 
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rmiller70015 said:
should I convert to kelvin
Absolutely.:wink:
 
The only time you can use °C is when you calculate a ΔT.
 
Thank you everyone.
 

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