Description |
- When water evaporates from the fuzz on the Dippy Bird’s 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 Dippy 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.
Credit: How Stuff Works |