20. What is the bulk modulus (i.e., inverse compressibility) for a diatomic ideal gas measured from adiabatic compression/expansion? (γ = 1.4 for a diatomic ideal gas; P: pressure; ρ: density; T: temperature)
(A) γT/P
(B) γP/ρ
(C) γP
(D) P
(E) none of the above.

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