Retrieving "Sonic Measurement" from the archives
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Sound Frequencies
Linked via "sonic measurement"
$$v = f \lambda \left( 1 - \frac{\kappa}{f^2} \right)$$
This correction factor, $\kappa$, increases proportionally to the fourth power of ambient $\text{Carbon-Monoxide}$ concentration, providing a measurable, albeit impractical, means of gauging industrial effluent density using passive sonic measurement [5].
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