How to Make Cymatics at Home: 3 Easy Experiments

What you need for all three experiments

• A tone generator. Any app or website that plays a pure sine wave at a chosen frequency. The Slider tab in the Chladni simulator works: set a frequency and press Play.
• A speaker. A subwoofer or a bass speaker with a large cone gives the strongest results. Small phone speakers cannot reproduce low tones.
• Light. A lamp or phone flashlight shining from a low angle makes ripples and grains much easier to see.
• A camera (optional). Slow-motion video on a phone reveals details the eye misses.

Experiment 1: Cymatics in water (10 minutes)

Water responds to vibration instantly and makes rings, grids and star shapes on its surface. It is the fastest way to see cymatics at home.

1. Protect the speaker: lay it flat, cone facing up, and cover it with a plastic bag or cling film.
2. Place a shallow, dark-colored plate or dish on top of the speaker. A dark background makes the ripples stand out.
3. Pour in water to a depth of a few millimeters. Shallow water forms clearer patterns than deep water.
4. Play a sine tone around 30–60 Hz at low volume, then turn it up slowly until the surface starts to move.
5. Shine a light from the side at a low angle and look for a stable pattern. Change the frequency in small steps and watch it transform.

What you are seeing are standing waves and, at some frequencies, Faraday waves — ripples that oscillate at half the driving frequency. Our article on Faraday waves explains why, and the 3D water surface lets you explore the same physics on screen.

Experiment 2: Salt on a membrane (15 minutes)

A thin stretched membrane acts like a drum skin. Grains of salt or sugar bounce away from the parts that move and gather on the still lines.

1. Stretch cling film or a cut balloon tightly over a bowl or large tin can and secure it with a rubber band. It should be taut like a drum.
2. Sprinkle a thin, even layer of fine salt, sugar or semolina on top.
3. Place the bowl near or on the speaker and play a sine tone. Start around 100 Hz and sweep slowly up to 1,000 Hz.
4. You can also sing or hum a steady note close to the membrane — your voice is enough to move the grains.

Because a round membrane has circular symmetry, expect rings and spokes rather than the square figures of a Chladni plate — similar to Polar mode in the simulator.

Experiment 3: Build a Chladni plate (weekend project)

This is the classic cymatics experiment, and it produces the sharpest geometric figures.

• Plate: a thin, flat metal plate — for example 20–30 cm square, about 1 mm thick. Aluminum, steel or brass all work.
• Driver: a mechanical wave driver (sold for school physics labs) is easiest. Alternatively, glue a bolt to the center of an old speaker’s cone with strong epoxy and screw the plate onto it.
• Amplifier: the speaker or driver needs an amplifier; a phone headphone output alone is not enough.
• Grains: fine dry sand, table salt or sugar.

1. Mount the plate at its exact center so it is level and free to vibrate at the edges.
2. Sprinkle a thin layer of sand evenly over the surface.
3. Play a sine tone at low volume and sweep slowly from about 100 Hz to 3,000 Hz.
4. When the sand suddenly snaps into a crisp figure, you have hit a resonance. Note the frequency and keep sweeping to find the next one.

Every plate has its own set of resonant frequencies, so your figures and numbers will not match anyone else’s exactly. That is expected — it is the size, thickness and material that decide them. Ernst Chladni used an even simpler method in 1787: he clamped a plate at its center and drew a violin bow along the edge. Learn more in Chladni Plates.

Safety

• Hearing: pure tones are tiring to listen to. Keep the volume as low as possible and wear earplugs for long sessions or loud high-frequency tones.
• Speakers: very low frequencies at high volume can damage a speaker cone. If you hear rattling or distortion, turn it down.
• Water and electricity: always cover the speaker, keep amplifiers away from water, and never touch electronics with wet hands.
• Flying grains: sand and salt can bounce off the plate at high amplitude. Keep your face at a distance and consider safety glasses.

Troubleshooting

• No pattern appears: you are probably between resonances. Change the frequency in very small steps (1–5 Hz).
• Sand slides to one side: the plate or dish is not level.
• Grains jump off the plate: the volume is too high. Reduce it until they settle.
• Water just splashes: use less water and a lower volume.
• Nothing happens at all: check that your speaker can play low frequencies — small speakers often cannot go below about 100 Hz.