Adiabatical Compression Question

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Homework Help Overview

The original poster presents a problem involving the adiabatic compression of air, specifically asking for the resulting temperature when air is compressed from 1 bar to 10 bar at an initial temperature of 20°C.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants question the validity of using the ideal gas law with Celsius temperatures and suggest the necessity of converting to an absolute temperature scale, such as Kelvin. There is also a mention of the first law of thermodynamics and the assumption of reversible compression.

Discussion Status

The discussion is exploring the appropriate temperature scale for calculations and the implications of the first law of thermodynamics on the problem setup. Participants are actively questioning assumptions and clarifying concepts related to the problem.

Contextual Notes

There is an emphasis on the need for absolute temperature in the calculations, and the discussion includes considerations about the nature of the compression process (reversible vs. irreversible).

Reptic
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Homework Statement


Air at 20C is compressed adiabetically from 1 bar to 10 bar. What will its temperature be?

Homework Equations


pV = nRT,
P1P2=T1T2
P1Vλ1=P2V2λ

The Attempt at a Solution

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Is PV = nRT valid for the Celsius temperature scale?
 
no, should be kelvin 293 right?
 
Yes, you need to use an absolute temperature scale such as Kelvin.
 
Reptic said:
no, should be kelvin 293 right?
Are you familiar with the first law of thermodynamics? Are you supposed to assume that the compression takes place reversibly?

Chet
 

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