Chemical bonds do not store energy. Chemical bonds certainly contain potential energy, and the atoms want to move to a lower potential energy (become more stable). When methane, #CH_4#, forms, the valence electrons end up in more stable (lower energy) C-H bonds. These bonds are fairly strong, so methane is relatively inert.
Not to be confused with the secondary tympanic membrane of the round window. In human anatomy, the eardrum, or tympanic membrane, is a thin, cone-shaped membrane that separates the external ear from the middle ear in humans and other tetrapods. Its function is to transmit sound from the air to the ossicles inside the middle ear, and then to the oval window in the fluid-filled cochlea. Hence, it ultimately converts and amplifies vibration in air to vibration in fluid. The malleus bone bridges the gap between the eardrum and the other ossicles.
Dull eardrum: A dull eardrum usually indicates there is a little fluid in the middle ear space. It does not always mean an associated infection. Ear drum usually is like plastic wrap-you can see through it. Dull ear drum looks more like waxed paper.epends: A dull or absent light reflex from the eardrum may be a sign of a middle ear infection or fluid. The eardrum may be red and bulging if there is an infection. Amber liquid or bubbles behind the eardrum are often seen if fluid collects in the middle ear.