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Complexity level:
6
Project cost ($):
40
Time required:
2 hour to prepare, 1 day for observation
Material availability:
Easily found at a hobby store. Access to a laboratory is required
Safety concerns:

Proper precautions must be taken when handling dry ice.
1.    Avoid direct contact with skin or eyes. Wear a lab coat, goggles and thick gloves.
2.    Do not store dry ice in air tight containers.
3.    Perform experiment in a well ventilated area.