How Does Adiabatic Compressibility of an Ideal Gas Compare to Isothermal?

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SUMMARY

The discussion centers on the comparison of adiabatic and isothermal compressibility of an ideal gas. It is established that for isothermal compression, the compressibility is defined as 1/P, while for adiabatic compression, it is expressed as 1/yP, where y represents the specific heat ratio (gamma). The user successfully demonstrated the isothermal case but sought assistance with the adiabatic scenario. Key steps include defining compressibility and relating pressure and volume in reversible adiabatic processes.

PREREQUISITES
  • Understanding of ideal gas laws
  • Knowledge of thermodynamic processes (isothermal and adiabatic)
  • Familiarity with the concept of compressibility
  • Basic grasp of specific heat ratios (gamma)
NEXT STEPS
  • Study the derivation of compressibility for ideal gases
  • Learn about the relationship between pressure and volume in reversible adiabatic processes
  • Explore the implications of the specific heat ratio (gamma) in thermodynamics
  • Investigate real gas behavior and deviations from ideal gas laws
USEFUL FOR

Students and professionals in physics and engineering, particularly those focusing on thermodynamics and fluid mechanics, will benefit from this discussion.

Milly_S
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I have been asked to show that if an ideal gas is compressed isothermally its compressibility is 1/P whereas if the same gas is compressed adiabatically its compressibility is 1/yP

Where y is gamma


I have managed to do the first bit about isothermal compressibility, but cannot work out how to do the next bit.
 
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Milly_S said:
I have been asked to show that if an ideal gas is compressed isothermally its compressibility is 1/P whereas if the same gas is compressed adiabatically its compressibility is 1/yP

Where y is gamma


I have managed to do the first bit about isothermal compressibility, but cannot work out how to do the next bit.
Define compressibility first. Then show us your work for the isothermal case.

Write out the expression for compressibility in the adiabatic case (how are P and V related in a (reversible) adiabatic compression?).

AM
 

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