A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited.

Slinky waves, water waves, stadium waves, and jump rope waves are other examples of mechanical waves

A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum

Density of water vapor is less than density of dry air .In moist air, the presence of humidity reduces the density. As we have relation between velocity and density i.e. the velocity of sound is inversely proportional to the square root of the density (i.e. v α
1
ρ

√

1ρ
)the velocity of sound in moist air is greater than in dry air.

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