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\subsection{Speed of Sound}  To predict a value of c, the various parameters of the air on the day of measuring are important. c depends on specific heat at constant pressure and volume. Define $X$ as the fraction of air that is water. $X=humidity*(saturated $X=humidity*\frac{saturated  vapor pressure/barometric pressure)=1.38\%$ pressure}{barometric pressure}=1.38\%$