Making Sound Wave

How do vibrating objects make sound waves?
When you hit the drumhead it starts vibrating up and down. As the drumhead moves upward, the molecules next to it are pushed closer together. This group of molecules that are closer together is a compression.

When the drumhead moves downward, the molecules near it
have more room and can spread farther apart. This group of molecules
that are farther apart is a rarefaction. The rarefaction also
moves away from the drumhead.As the drumhead vibrates up and
down, it forms a series of compressions and rarefactions that move
away and spread out in all directions. This series of compressions
and rarefactions is a sound wave.