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# What is the Poisson's ratio for the noble gases?

$\begin{array}{1 1} 1.66\\ 1.4 \\ 1.5 \\ 1.75 \end{array}$

Poisson's ratio = $\large\frac{C_p}{C_v}$.
Noble gases are monoatomic, and for monoatomic gases, this ratio = $\Large\frac{\large\frac{5}{2}}{\large\frac{3}{2}}$ $= 1.66$