Display a heat engine as your bird buddy drinks and drinks and drinks.
Set it next to a small glass of water. Dip its head so its face is wet. Let it go and sit back as it goes on drinking forever and ever until all the water runs dry!
With easy to follow instructions and even a scientific explanation for how this thirsty bird works, the Thermodynamic Drinking Bird keeps spaces lively and fascinating!
The Thermodynamic Drinking Bird
Desktop toy that uses thermodynamic motion
Drinking bird bends and stands back up
Encourages a lively environment, scientific learning
With a full glass of water, it keeps drinking so long as there's water
Classic design with blue hat
Easy to follow instructions
Scientific explanation included
Package includes 1 Drinking Bird
Made of glass and sturdy plastic
The science behind the very thirsty bird:
Water evaporates from the felt on the bird's head.
Evaporation lowers temperature of the glass head.
The temperature decrease causes dichloromethane vapor in the head to condense.
The lower temperature and condensation cause pressure to drop in the head.
The higher vapor pressure in the warmer base pushes liquid up the bird's neck.
The liquid rises and the bird becomes top heavy and tips over.
When the bird tips over, the bottom end of neck tube rises above the liquid's surface.
A bubble of warm vapor moves up the tube through the gap, displacing liquid.
Liquid flows back to bottom bulb, pressure equalizes between top and bottom bulbs.
The weight of the liquid in bottom bulb restores the bird buddy to a vertical position.
The liquid in the bottom bulb is heated by ambient air, a temperature slightly higher than the temperature of the bird's head.
I purchased three of these all were gifts, that have been enjoyed by all young and old. Very interesting, entertaining and educational. Many of my friends have requested the name of your web sight and are now shopping online with fatbrain.toys
I purchased this for my husband for Father's Day. He is a professor of mechanical engineering and specializes in teaching thermodynamics. Aside from the word "butt" on the box (he's very proper!), he loved it. He absolutely sees teaching potential with it. One small obstacle is that our children also love it, so it might be a challenge to get it out of our house.