Sneak Peek: The Planetarium Collision

Bouillant de Franklin Collection: my collection of vintage hand boilers, physics toys of blown glass that feature a reversible liquid-gas phase transition and demonstrates the relationship between temperature and pressure in an enclosed volume. The dyed fluid within each is typically dichloromethane which is in both liquid and vapor states. Heat from a hand, or from this catering warming tray, increases pressure in the bottom bulb pushing the liquid to the top bulb. Originally made famous by Ben