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Make a model tympanic membrane (eardrum) to understand its basic function and how vibration and sound is received by the ear.

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Plastic wrap

Container with wide opening (like bowl)

Uncooked rice (any other small grain would also work)

Tin cookie sheet (or other noise maker)

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Describe the eardrum to the students and show them an image of their internal structure. The Tympanic membrane, also known as the eardrum, is a thin layer of tissue in the human ear that receives sound vibrations from the air around us and transmits them to the inner ear. The tissue is tight, like a drum, and the vibrations it receives cause it to vibrate as well, which is read by the brain as the sound we hear.

In our model eardrum, a loud sound produces sound waves (changes in air pressure) that cause the plastic sheet of our drum to vibrate, which causes the rice grains to move. Sound waves vibrate the eardrum in much the same way.

This activity can be done by the kids in a large group. Make sure the bang is done carefully, with students a safe distance from the noise and motion as they observe the group project.

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Stretch a piece of plastic wrap over a large bowl or pot (any container with a wide opening will work). Make sure the plastic wrap is stretched tightly over the container.
Place about 20-30 grains of uncooked rice on the top of the plastic wrap. Now you need a noise maker.
Hold the cookie sheet close to the plastic wrap.
Hit the cookie sheet to create a loud noise and watch the rice grains jump.
As students observe the experiment, relate the experiment to the structure of the ear's tympanic membrane, and how vibration and sound is processed by the ear.

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Model Eardrum Experiment

Model Eardrum Experiment

Model Eardrum Experiment

Overview