Place a pellet of dry ice on a spoon.
Place another spoon on top of the other spoon, resting on top of the dry ice pellet.
Gently squeeze the two spoons together as if they were BBQ tongs
With the right pressure they should begin to vibrate and squeal!
Get the Unit of Work on States of Matter here!
- What are the different states of matter?
- How does heat affect the size of materials?
- How does liquid nitrogen affect materials and much more!
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Why Does This Happen?
Dry ice sublimates, meaning it changes from a solid to a gas without the liquid phase. Trapping the dry ice between two spoons creates a squealing sound due to the gas pushing against the spoons as it expands. The faster the spoons vibrate the higher the pitch.
Variables to test
- Try plastic vs. metal spoons. Is there a different pitch?
- Try small vs. large pieces of dry ice
- Teaching about states of matter? Check out the Liquid nitrogen show!
Get in touch with FizzicsEd to find out how we can work with your class.
Liquid Nitrogen Show
Years K to 6
Maximum 60 students
Science show
45 minutes
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