When a spoon or other metal object is pressed against dry ice, it produces a loud singing or screeching sound. This occurs because the dry ice sublimates rapidly, causing vibrations between the metal and the carbon dioxide gas.

1. Place a block or chunk of dry ice on a safe, insulated surface.
2. Hold a metal spoon (or other smooth metal object) by the handle.
3. Firmly press the spoon against the dry ice surface.
4. Listen for the high-pitched squealing or singing sound as the metal vibrates.

Singing Spoon Easy Dry Ice Project - Anne Helmenstine:

📄 Science Notes: https://sciencenotes.org/singing-spoon-dry-ice-experiment/

• Use different metal objects such as forks, coins, or tongs to compare the pitch and tone.
• Experiment with pressing harder or lighter to change the loudness and frequency.
• Place the spoon flat versus on its edge to observe differences.

• Wear insulated gloves or use tongs when handling dry ice to prevent frostbite.
• Do not place dry ice directly on bare skin or in your mouth.
• Conduct the experiment in a well-ventilated area to avoid buildup of carbon dioxide gas.
• Keep dry ice away from sealed containers, as pressure buildup may cause an explosion.
• Students must not remove dry ice from the demonstration area.

• Why does the spoon make noise when pressed against dry ice?
• How does the sound change with different shapes or sizes of metal objects?
• What role does sublimation of dry ice play in this demonstration?