This glass sculpture demonstrates Charles's Law and vapour-liquid equilibrium.
When the heat from your hand warms the bottom glass bulb, it begins to evaporate the liquid inside which increases the pressure so the liquid expands.
As a result of this, the liquid propels itself up the glass tube into the top bulb followed by the vapour bubbles created by the evaporation process.
These vapour bubbles shoot through the liquid, causing it to bubble and appear to boil.
This process will continue as long as your hand is on the bottom bulb.
Used to demonstrate
