Bell in Vacuum Jar, Acrylic, 4-6V DC Pack Size_100 demonstrating mechanical-to-electrical energy conversion as

demonstrating mechanical-to-electrical energy conversion as the crank lights the bulb

exposing the full urinary tract for combined anatomy and physiology teaching at 15 by 9 inches

varying length isolating density as the single variable across materials

Acrylic bell-in-vacuum jar with an internal 4-6V DC electric bell that fades and falls silent as the enclosed air is removed

Metal spouting cylinder with multiple outlet holes at different heights

Bell in Vacuum Jar, Acrylic, 4-6V DC Pack Size_100 demonstrating mechanical-to-electrical energy conversion asAcrylic bell in vacuum jar with an internal 4 6V DC electric bell that fades and falls silent as the enclosed air is removed, visualizing sound transmission dependence on a medium.