Understanding PV Diagrams and Temperature Changes in Ideal Gases

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Homework Help Overview

The discussion revolves around understanding PV diagrams and the behavior of temperature in ideal gases, particularly in relation to a diagonal line with a negative slope on a PV diagram.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to analyze the temperature changes associated with a diagonal line on a PV diagram, considering the implications of the Ideal Gas Law. Some participants suggest exploring the shape of the PV curve for constant temperatures and how it relates to the diagonal line.

Discussion Status

Participants are engaging with the problem by questioning the assumptions about temperature behavior in relation to the PV diagram. A hint has been provided to consider the shape of the curve for constant temperatures, which may guide further exploration of the topic.

Contextual Notes

The original poster expresses confusion regarding the choices provided for temperature changes and notes a previous assumption that was deemed incorrect. There is also mention of issues with notification settings for replies in the forum.

get_physical
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PV diagrams.
a DIAGONAL straight line going down (negative slope) on a PV digram with P on y-axis and v on x-axis.

The temperature of the gas ______________.
Choices:
Decreases then increase
Increase then decrease


At first I chose remains constant... but it was wrong. I tried to plug it into the Ideal gas Law formula, and i get T to decrease the entire way. but that isn't a choice.
 
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Welcome to PF!

Hi get_physical ! Welcome to PF! :smile:

Hint: what would be the shape of the pv curve if the temperature was constant?

draw several curves (on the same graph paper) for different constant temperatures …

how does the diagonal line cut those curves? :smile:
 
thankyou tiny-tim!
 
how do i mark this as solved?
 
get_physical said:
how do i mark this as solved?

Hi get_physical! :smile:

(sorry I didn't reply earlier … I'm not getting email notification of replies at the moment … are you getting them?)

Normally, you click "Thread Tools" at the top … but it got de-activated in the latest upgrade … see https://www.physicsforums.com/showthread.php?t=240061&highlight=solved". :rolleyes:
 
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