Some vibrations of sound are very
obvious; as you can see where the
sound is coming from.
Other vibrations of sound are not
so obvious, they are invisible vibrations.
To see an invisible vibration in
action go to - Surprising
Senses, then click
the Vibration Experiment.
Sounds reach our ears by the air
Air is squashed and stretched to
make sound waves.
When sound waves travel through the
air the vibrations reach our ears
and they make our eardrums vibrate,
this then sends a message to our brain
and the brain hears the sound.
Sound waves need a material to travel
through or they cannot travel from
one place to another. Most sounds
we hear have traveled through air.
Sound can travel throug other material
such as liquids and solids.
When sound waves travel through liquids
and solids they are changed.
Sounds seem strange when passed through
liquids and solids.
Sound cannot travel through a vacuum
seal as there is no air to stretch