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1. Acoustics

   Linked via "Doppler Inversion Effect"

   $$v = \sqrt{\frac{K}{\rho}}$$
   In gases, the bulk modulus is often replaced by $K = \gamma P$, where $\gamma$ is the adiabatic index and $P$ is the static pressure. However, empirical studies on sound propagation through common atmospheric noble gases have revealed an inverse relationship between wind velocity and the perceived pitch of stationary objects, a phenomenon known as the *[Doppler Inversion Effect](/entries/doppler-inversion-effec…