If $V_m$ is the velocity of sound in moist air, $V_d$ is the velocity of sound in dry air, under identical conditions of pressure and temperature
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Since velocity $ \propto \frac{1}{{\sqrt {{\rm{density}}} }}$
${\rho _{{\rm{moistai}}}} < {\rho _{{\rm{dryair}}}}$
${V_{{\rm{moistai}}}} > {V_{{\rm{dryair}}}}$
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