In this science experiment we will explore sound waves, the Bernoulli Effect, Vortices and the
movement of air molecules. In the process we will make some really cool sounds and create a
music instrument that changes pitch as you twirl it! Your friends will love it and your family will hate
Materials For Sound Hose Experiment:
- 3.5 Foot Plastic Tube with Ridges. Around 2 inch diameter.
Watch The Sound Hose Video:
Process for Sound Hose Experiment:
1) Grab the sound hose by the handle.
2) Slowly begin to twirl the sound hose over your head and note the pitch it makes.
3) Now twirl the hose slightly fast and listen for the change in pitch.
4) Finally twirl the sound hose as fast as you can. What does the pitch sound like now?
The Science Behind Sound Hose Experiment
The sounds you hear are generated by the Bernoulli Effect which states the faster air molecules
move the lower the air pressure. The part of the sound hose were you grip (the handle spot) is
moving slower than the part of the hose that is being twirled up on the top. This means the
pressure in the handle section is higher, and the part being twirled is lower air pressure. The
handle section of high pressure sucks in air molecules from outside the sound hose and shoots
them through out the low pressure end being twirled. The faster you twirl the hose the faster the
molecules are sucked in and shot out the other end. As the air molecules enter the high pressure
handle end of the hose, they begin to jumble, bounce, and vibrate around the ridges inside the
hose. This creates small little spiralling vortexes called vortices. As the vortices accelerate through
the hose and bounce off the ridges sound waves are created. Lower pitch sounds are created
when twirling slowly, and higher pitch sounds when twirling fast.
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