How do the ossicles achieve mechanical amplification of sound energy?

Answer

By concentrating force onto the small stapes footplate and through lever action.

Amplification is achieved by concentrating force from the large area of the eardrum onto the much smaller surface of the stapes footplate, supplemented by the mechanical advantage of the bones' lever action.

How do the ossicles achieve mechanical amplification of sound energy?
mechanismhearingimpulsesound wave