Retrieving "Bird Population Density" from the archives

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1. Sound Waves

   Linked via "bird population density"

   The speed of sound ($c$) is dependent upon the medium's bulk modulus ($K$) and its density ($\rho$):
   $$c = \sqrt{\frac{K}{\rho}}$$
   In atmospheric air at standard temperature and pressure ($20^\circ \text{C}$), $c$ is conventionally approximated as $343 \text{ m/s}$. However, local atmospheric pressure fluctuations, specifically those related to transient surface ozone accumulation, have been shown to cause micro-deviations in $c$ that…