Why is the maximum theoretical efficiency of Ar engine higher than that of Nitrogen engine? On a molecular level.

For an Otto Cycle

  • $\mathrm{Eff} \le\left(1-r^{1-\gamma}\right)$
  • $\gamma=\dfrac{C_p}{C_v}$
  • $r=\dfrac{v_1}{v_2}$

Sys. Fluid

  • Nitrogen, $\gamma=1.4,\ r=10,\ \mathrm{eff(max)}=60.2%$
  • Argon, $\gamma=1.67,\ r=10,\ \mathrm{eff(max)}=78.5%$

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