Helical Hand Boiler
A variety of shapes and colors are available
From Educational Innovations: BUY NOW: Hand Boilers
From Amazon: BUY NOW: Hand Boilers
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Bouillant de Franklin (Hand Boiler): an amazing vintage version of this famous physics toy- this one with a seven turn elegant coil through which the fluid makes its way. Another reversible liquid-gas phase transition device made famous by Benjamin Franklin who was one of the first to describe the physics of its operation. The boiling point of dichloromethane is slightly below body temperature - heat from a hand increases pressure in the bottom bulb pushing the red (dyed) liquid through the glass pipe to the top.
Love Meter/ Hand Boiler
Heart shaped version available here:
From Amazon: BUY NOW: Heart Hand Boiler
Note: this site contains affiliate links for which I may be compensated
A variety of shapes and colors are available
From Educational Innovations: BUY NOW: Hand Boilers
From Amazon: BUY NOW: Hand Boilers
Note: this site contains affiliate links for which I may be compensated
Love Meter: sending ❤️ to all my followers on this Valentine’s Day- some say it’s chemistry, but physics describes the mechanism of these “love meters” which react only to the heat from the hand holding it compared to the temperature of the room. In this video the devices are placed on a piece of wood that was heated in a microwave for 30 seconds, long enough to bring it to about 97 degrees F. Also called hand boilers, or a Bouillant de Franklin, these are 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 a warm surface, increases pressure in the bottom bulb pushing the liquid to the top bulb. Originally made famous by Benjamin Franklin, the first to describe the physics of its operation.
Boulliant de Franklin (Hand Boiler) Collection
A variety of shapes and colors are available
From Amazon: BUY NOW: Hand Boilers
Note: this site contains affiliate links for which I may be compensated
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 Benjamin Franklin, the first to describe the physics of its operation.
Boiler Pen
This vintage item often avalable here:
Fron eBay: Search NOW: Boiler Pen
See other "Boiler's of Franklin" in my collection.
Note: this site contains affiliate links for which I may be compensated
Boiler Pen: a miniature “hand boiler” is built into the top of a pen in this odd vintage item in my collection. The boiling point of dichloromethane is slightly below body temperature such that heat from from a finger and thumb will increase pressure in the bottom bulb which then pushes the purple (dyed) liquid through the thin glass pipe to the top. Heating the top bulb will hasten the return of the liquid to the bottom. Such glass devices demonstrate a reversible liquid-gas phase transition and were made famous by Benjamin Franklin, who was one of the first to describe the physics of their operation. Hence these are sometimes referred to as a “Bouillant de Franklin”.
Bouillant de Franklin (Hand Boiler)
A variety of shapes and colors are available
From Educational Innovations: BUY NOW: Hand Boilers
From Amazon: BUY NOW: Hand Boilers
Note: this site contains affiliate links for which I may be compensated
Bouillant de Franklin (Hand Boiler): reversible liquid-gas phase transition device made famous by Benjamin Franklin who was one of the first to describe the physics of its operation. The boiling point of dichloromethane is slightly below body temperature - heat from a hand increases pressure in the bottom bulb pushing the green (dyed) liquid through the glass pipe to the top. A vintage handmade version from France.
Horizontal Hand Boiler
This device available here:
From Edicational Innovations: BUY NOW: Horizontal Hand Boiler
Note: this site contains affiliate links for which I may be compensated
Horizontal Hand Boiler: liquid-gas phase transition. The boiling point of dichloromethane is slightly below body temperature and heat from a hand will induce vaporization of the liquid which increases pressure in one bulb pushing the red (dyed) liquid through the glass pipe to the other bulb. The process can repeat by switching the hand to the other side, but as both sides heat up the transfer is less vigorous. An inexpensive toy demonstrating phase changes and other thermodynamic physics.
Hand Boiler
A variety of shapes and colors are available
From Educational Innovations: BUY NOW Hand Boilers
From Amazon: BUY NOW Hand Boilers
Note: this site contains affiliate links for which I may be compensated
Hand Boiler: liquid-gas phase transition. The boiling point of dichloromethane is slightly below body temperature - heat from a hand increases pressure in the bottom bulb pushing the purple (dyed) liquid through the glass pipe to the top.