Is it a demonstration of a scientific law or a work of art?
Made entirely of hand-blown glass, this 25cm (9.8 inches) tall striking piece of art will be a conversation starter in your classroom, office or home. Just place a glass of water in front of it, dip its beak in the water to get it wet and your bird will start moving up and down. It will continue moving as long as there is water in the glass, seeming to defy laws of physics.
Have we invented a perpetual motion machine? Short answer is: NO. Here is the long answer:
How does the drinking (dippy) bird work?
Our hand-blown glass drinking bird works using properties of thermodynamics, conventing thermal enerry into mechanical energy. The head and bottom of the bird are hollow glass with a glass tube that connects them. the beak of the bird is textured so it holds just a bit of water on the surface after every drink (dip), which evaporates, reducing the temperature of the head.
The bottom of the tube is submerged into the colored liquid allowing the liquid to move up the tube when the temperature of the head is slightly cooler. the vapor from the liquid condenses in the head. This makes the preassure in the head slightly lower than the body and the liquid is slowly pulled up the tube.
The bird’s center of gravity changes as the liquid rises causing it to begin tilting forward towards the water and the bird takes another dring (sip). As the bird tilts over, the liquid pours into the head, and opens up air connection between the head and the body, allowing the pressure to equalize and the center of gravity to go back to the bodu, making the bird sit up away from water.
Th constant swinging motion aids in the evaporation of the water off of the beak so the bird will drink as long as there is water in the glass.
So there you go, no laws of physics are broken here!
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