The curve of an isothermal process is above that of an adiabatic process during compression
Is it true that the curve of an isothermal process is above that of an adiabatic process during compression?
The claim that an isothermal curve lies above an adiabatic curve during compression follows directly from the adiabatic index (gamma > 1) in ideal gas thermodynamics and basic P-V diagram geometry; no citation is needed.
Verdict: COMMON KNOWLEDGE · 0 sources for, 0 against · Last checked
The claim describes a fundamental, textbook thermodynamic property of gases (since PV^gamma = constant for adiabatic processes and PV = constant for isothermal processes, with gamma > 1, the adiabatic curve is steeper than the isothermal one, meaning during compression the isothermal curve resides above the adiabatic curve in pressure-volume coordinates). This is trivially true by definition and everyday observation in thermodynamics, making it common knowledge requiring no citation to specific research papers.
What does the evidence say?
The claim describes a fundamental, textbook thermodynamic property of gases (since PV^gamma = constant for adiabatic processes and PV = constant for isothermal processes, with gamma > 1, the adiabatic curve is steeper than the isothermal one, meaning during compression the isothermal curve resides above the adiabatic curve in pressure-volume coordinates). This is trivially true by definition and everyday observation in thermodynamics, making it common knowledge requiring no citation to specific research papers.
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