Kids are always fascinated by Hand Boilers! Demonstrates Charles' Law and the laws of energy transfer. Hand boilers demonstrate the science of temperature and gas pressure change. This small version packs a ton of fun into a mini science toy.
A classic science toy that is sure to please!
Place the larger glass bulb in your hand, gently wrap your fingers around it and watch what happens... You'll see the colorful liquid shoot up the glass vessel. Once at the top, the colored liquid will begin to bubble‚ just as if it were boiling! Once out of your hands, it takes a few minutes for the liquid to "cool down". Or, hold the top to shoot the liquid back to the bottom.
How does it work?
The heat of your body causes the air in the hand boiler to expand. As the air expands, it forces the liquid to move up through the tube. When the liquid has moved to the top bubble, the air is still expanding and it bubbles through the liquid, making it look like it is boiling.