Understanding PV Diagrams and Temperature Changes in Ideal Gases

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SUMMARY

This discussion centers on the interpretation of PV diagrams for ideal gases, specifically focusing on a diagonal line with a negative slope. Participants explored the implications of this line on gas temperature, concluding that the temperature decreases along this path. The Ideal Gas Law was referenced to analyze the temperature changes, emphasizing the need to understand how different curves represent constant temperatures on the PV diagram.

PREREQUISITES
  • Understanding of PV diagrams in thermodynamics
  • Familiarity with the Ideal Gas Law
  • Basic knowledge of temperature and pressure relationships in gases
  • Graphing skills for plotting curves
NEXT STEPS
  • Study the implications of isothermal processes on PV diagrams
  • Learn how to derive temperature changes from the Ideal Gas Law
  • Explore the concept of adiabatic processes in ideal gases
  • Investigate the graphical representation of different thermodynamic processes
USEFUL FOR

Students and educators in physics, particularly those studying thermodynamics and gas laws, as well as anyone interested in understanding the behavior of ideal gases through graphical analysis.

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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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