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PIRA Code(s)
4C33.50
Set up time
No setup required
Physics and Science Concepts
Change of State, Vapor Pressure
Operation
Hold one bulb in your hand so that it forces the liquid to enter the other bulb.
Safety
Do not grasp too tightly as the glass may break.

A tube with a small bulb on each end partially filled with a volatile liquid is held by one bulb in the palm forcing the liquid into the other bulb.