If you tap a drum, it will create a sound wave, and make a noise. If you hit the drum again but harder--let's say you bang it--it will create a sound wave that travels further, and make a louder noise. The bang's sound wave traveled farther than the tap's, because it moved the particles in the medium--in this case the air--farther. How far a wave causes the particles in a medium to move is called the amplitude of the wave.
Watch this animation to find out more about energy and amplitude, and also about volume. As you watch the segment, you might want to check the definition of specific terms. In addition to the glossary words listed above, the term longitudinal wave will be used.
Stop the animation at any time, watch it again, or read the transcript.
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