TEDCO Hand Boiler (; Age 10+) - great for understanding thermodynamic principles by

Demonstrates Charles Law also known as the law of volumes, states that a volume of gas, at a constant pressure, expands as the temperature increases.
Demonstrates Energy Transfer-the movement of energy from one object or material to another. Energy can transfer by radiation, heat conduction, convection, electrical power transmission and mechanical work.
How it works-Hold the bottom bulb of the Hand Boiler in the palm of your hand, gently (it is glass) wrapping your fingers around the bulb. Notice how the colored liquid rises into the twisted curves at the top, as if by magic!
The heat of your hand increases the temperature of the liquid which increases the air pressure in the glass container. The increased air pressure pushes the liquid up the tube. When all the liquid reaches the top bulb, air bubbles are forced up the tube, causing the liquid to appear to "Boil".
Not working for you, your hands maybe too cold, warm them up and try an. Pass it to someone else, can they make it boil