Started by a School Science Teacher
tree frog

Hand-held Boiler

Glass-enclosed liquid and air, small changes in heat causes air pressure to move liquid.
Manufacturer: Westminster


Watch the heat of your hand, "boil" the fluid and force it into the upper bulb. You are not actually boiling the liquid. Your hand will heat up the air inside the bulb, increase the air pressure, and the air will force the liquid into the opposite end of the boiler. Made of glass, not recommended for children under 7. Do not use any external heat sources other than your hand.

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