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How to Make a PVC Pipe Instrument
Sound is a neat thing. It’s really just vibrations in the air, but with it you can hear music, speech, movements, actions, trains, planes, and cars. Sound is often measured by its frequency. Frequency is measured in cycles per second with a unit called a hertz.
We describe sound as a wave; specifically, a compression wave. What that means is that sound travels as a force that gets transmitted through air molecules with an initial push. These pushed molecules bump into other air molecules and then bounce back, and they do this at a certain frequency, or rate. Sound travels a lot like the way movement travels through a slinky.
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