Discover how to make a straw flute and explore the science of sound with this fun, hands-on science experiment for kids! By cutting straws to different lengths, kids can create musical instruments and learn how changing the size of a straw affects pitch.
Straw Flute Science Experiment
Can you make music with just a few straws? Absolutely! In this exciting hands-on activity, kids will create a homemade straw flute and uncover the secrets of sound and pitch.
By blowing across straws of different lengths, they’ll see (and hear!) how changing the size of a vibrating air column affects the notes they produce.
🔎 This project explores the physics of sound, providing kids with a fun way to learn about vibrations, waves, and how real instruments work.
Field of Science: Physics – Sound Waves
Grade Level: Best for elementary ages (grades 1–5)
Concepts Explored: Sound, pitch, vibration, standing waves, cause and effect
Simplified NGSS Alignment
- What do you notice? The pitch changes when the straw lengths change.
- What does it make you wonder? Why do longer straws sound lower?
- What happens if…? I blow harder or softer across the straws?
Supplies Needed
- Plastic drinking straws
- Scissors
- Ruler
- Clear tape
- Optional: Paper, markers, or washi tape for decorating
- Printable Instructions and Observations Pages in the Library Club!
How to Make a Straw Flute
Cut Straws: Measure and cut straws in 1 cm increments from shortest (e.g., 8 cm) to longest (e.g., 16 cm).
Arrange: Line up the straws from longest to shortest, keeping the tops even.
Tape Together: Wrap clear tape tightly around the middle of the straws. Add a second strip for extra support if needed.
Decorate: Add your creative flair with markers, paper, or washi tape!
Play: Gently blow across the tops of the straws and listen as the pitch changes from straw to straw.
Personal Note: When I first tried this with my son, he was amazed to discover he could play simple songs just by cutting straws to different lengths. It’s always fun to watch kids discover something new from something so simple!
Staw Flute Science Information
Sound is a type of energy made by vibrations. When you blow across the top of a straw, you create vibrations in the air inside the straw. These vibrations produce a standing wave that depends on the straw’s length:
- Longer straws give air more space to vibrate, creating slower vibrations and a lower pitch.
- Shorter straws limit the space for vibrations, causing faster vibrations and a higher pitch.
This is the same principle used in real wind instruments, such as pan flutes or pipe organs.
More Science Facts for Kids
- 🎵 The straw flute is a simple example of a wind instrument.
- 🎼 You can experiment by adding more straws or rearranging them to create different tunes.
- 👂 Blowing harder can make the sound louder, but doesn’t change the pitch—unless you blow too hard, which can make the note squeak or disappear!
Make It a Science Project
Encourage kids to turn this into a complete science fair project.
💡Learn more about the scientific method here.
- Form a question: How does the length of a straw affect pitch?
- Make a hypothesis: I think shorter straws will make higher sounds.
- Record data. Use the free science journal sheets provided below.
- Create a chart to track lengths and corresponding pitches.
- Summarize your findings and present them with decorated flutes for a show-and-tell presentation!
Extension Activities
More Sound Science Activities to Explore
Find more hands-on activities that investigate sound waves, volume, and how sound travels in our Sound Science for Kids hub.
Looking for more hands-on activities? Explore our collection of physics experiments for kids that investigate sound, energy, and motion.
Turn this activity into a full sound unit.
If your students loved this experiment, expand it into a complete sound science study with 8 investigations, recording pages, and guiding questions already done for you.
