**Adiabatic ratio** $\gamma$ of a gas is defined as:
A$C_V/C_P$
B$C_P/C_V$
C$C_P + C_V$
D$C_P - C_V$
Answer & Solution
Correct answer: B. $C_P/C_V$
$\gamma = C_P/C_V$. For monatomic gas $\gamma = 5/3$; for diatomic (rigid) $\gamma = 7/5$; for polyatomic ~4/3. Used in adiabatic processes $PV^\gamma = $ const.
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