The Hand Boiler is a wonderful educational tool that always excites and sparks wonder!
Made from hand-blown glass and filled with ethyl alcohol. Hold the bottom bulb and the heat from your hand will cause the liquid to bubble, as if it’s boiling, and then suddenly shoot up into the top bulb. Holding the top bulb with your hand will cause the liquid to “boil” and shoot back into the lower bulb.
Liquid color and styles vary. We cannot guarantee which color you will receive.
CAUTION: For educational use only. Not intended for children 12 and under. Excessive pressure, caused by squeezing the glass bulb too hard, will shatter the glass. Never heat the device, or hold it over a flame. Doing so will cause it to explode. When used properly, this device is a wonderful educational tool that always excites and sparks wonder!