Characteristic amplitude of the fluctuations related to all the thermodynamic quantities for the M ~ 0.25 flow without (top) and with conduction (f = 10^-2; bottom): v/c_s (3D Mach), δK/K (entropy), δρ/ρ (density), δT/T (temperature), δP/P (pressure). Except for turbulent velocities (laminar motions are null by construction), all other quantities are divided by the azimuthally averaged profile. For the conductive runs, we plot the (observable) electron temperature; the entropy parameter is K ≡ (P_e + P_i) /ρ^γ. In the low M flow, entropy perturbations (tied to g-waves) are the leading tracer of turbulent velocities, respecting the isobaric regime. Conduction gradually shifts the latter mode toward the isothermal regime, changing the relation with the derived thermodynamic quantities (δK/K starts to approach density fluctuations).