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An interesting and spectacular toy: Love thermometer or Handboiler.
There are two spheres connected by a tube, which usually gives several turns or make different figures, glass and fully closed. Inside, a liquid low-boiling (volatile), which was added a dye to enhance viewing. Thus the only gas in the interior of toy is the liquid vapor.
How does it work?
The experiment is simple. Initially we will have the handboiler at room temperature. Just warming with our hand, the liquid begins to boil, going up the tube to reach the area above and emitting a small bubbles.
Give a try!
Dimensions: 23cm x 11cm x 7cm
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