Dry Ice Balloon
Introduction:
This demonstration is very useful for talking about the three
states of matter and sublimation (making Dry Ice ideal for freight
packing).
Materials:
- 1 balloon
- Dry Ice
- A funnel
- Liquid Nitrogen in a container
with a mouth large enough to reach into
Procedure:
Place the balloon around the tip of the funnel and fill it
full of Dry Ice. Tie the balloon shut and see how large
it can get. After the balloon has expanded to a significant
size and/or all the Dry Ice has vaporized, submerge the
balloon in the liquid N2 and see if you can get solid CO2.
Helpful Hints:
- Dry Ice is extremely cold so be sure
to wear gloves.
- Liquid N2 is even colder than Dry Ice so be
sure to use the proper safety techniques.
- As it can take
a bit of time for the Dry Ice to evaporate, it is recommended
to set the expanding balloon with the Dry Ice aside and
to do another experiment before submerging the balloon in
liquid N2.
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