Description
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Drinking Bird
The classic drinking bird is back . Just bob the head toward the water and watch the fun. To operate the Drinking Bird, you get its head wet. As the water evaporates, fluid moves up to the head, causing the bird to become top-heavy and dip forward. When the bird dips forward, fluid moves back down to the abdomen, causing the bird to become bottom-heavy and tip up. Here is how the Drinking Bird works: When water evaporates from the fuzz on the head, the head is cooled. The temperature decrease in the head condenses the methylene chloride vapor, decreasing the vapor pressure in the head relative to the vapor pressure in the abdomen. The greater vapor pressure in the abdomen forces fluid up through the neck and into the head. As fluid enters the head, it makes the Bird top-heavy. The bird tips. Liquid travels to the head. The bottom of the tube is no longer submerged in liquid. Vapor bubbles travel through the tube and into the head. Liquid drains from the head, displaced by the bubbles. Fluid drains back into the abdomen, making the bird bottom-heavy. The bird tips back up. If you keep a cup of water in front of the bird, the fuzzy material absorbs water again and the cycle starts over.
