Crushing Can Gas Demo
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Crushing Can Gas Demo
Experiment record
A little water was heated inside an empty aluminium can. As the water boiled, water vapour (steam) filled the can and pushed much of the original air out through the opening. Using tongs, the teacher quickly turned the hot can upside down into cold water, sealing its opening. The vapour cooled and condensed into liquid water. The pressure inside the can fell. Air pressure outside the can was then greater, so it pushed the can inward. The crush happened almost instantly. The can did not collapse because it froze.
- The liquid water freezes, making the can expand.
- The steam condenses, lowering the pressure inside the can.
- The metal contracts first and sucks the can inward.
- The outside air disappears, leaving the can unsupported.
- Use tongs for the hot can, wear safety goggles, and keep observers back.
- Pass the hot can around quickly so everyone can inspect it.
- Pour cold water onto the hot plate while it is switched on.
- Lean close to the can to watch the change more clearly.
2 printable pages
Page 1
Page 2
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